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[[quoteright:350:[[Film/{{Alien 3}} http://static.tvtropes.org/pmwiki/pub/images/xenomorph_life_cycle.jpg]]]]
[[caption-width-right:350:The Xenomorph life cycle]]

->'''Wuffles: You are misinterpreting what you saw, Pieter!'''\\
'''Pieter:''' I saw the tentacles! I know what that means!\\
'''Wuffles: My reproductive organs are in my mouth! It doesn't work that way!'''
-->-- ''Fanfic/NobodyDies''

Okay, you've got your HumanoidAliens. But no matter what you do, they don't seem alien-y enough. So you add some BizarreAlienBiology. What's the easiest way to do this? Sex! Guaranteed to appeal to ''[[RuleThirtyFour somebody]]'', and if done right, it can look like something other than just being a pervert or possibly {{Fanservice}}. It should be added that no matter how deviant it seems to us, GoodPeopleHaveGoodSex and this counts as good sex, even if it is [[GreenSkinnedSpaceBabe interspecies]].

Sometimes related to GRatedSex. May fall into YouFailBiologyForever, if the reproductive method fails to generate enough offspring to maintain a population. Note for examples to not include anything related to cultural practices; we're limited to the biology of reproduction here. Put examples belonging to subtropes on their own pages, please.

* BizarreAlienSexes
* ChestBurster
* ExoticEquipment
* FacefulOfAlienWingWong
* MisterSeahorse
* NonMammalMammaries

Compare BizarreSexualDimorphism. If this trope is averted even when it shouldn't be, we're dealing with a MaleToFemaleUniversalAdaptor.



[[folder:Anime and Manga]]
* ''LightNovel/TheTwelveKingdoms'' has a truly weird reproductive system involving marriage but apparently no sex: when you get married, a fruit called Ranka grows on a tree, and out of it pops your baby. What makes it far weirder is that sometimes the Ranka fruit gets blown across the sea and is implanted in a Japanese woman - this is how the central character of the anime, Youko Nakajima, would have been born, though she thought she was a normal Japanese girl until she was taken by force from her high school. In addition, royalty and other immortals can't marry - and since Nakajima becomes a queen, that includes her - and so they can't have children unless they were married before they become immortal. While it's established that they DO have sex it's apparently only done for fun, with no connection to the reproductive process at all.
* In ''Anime/DragonBallZ'' the Nameks have only one gender (Males). They reproduce by puking eggs containing their offspring out of their mouths. This greatly confuses Bulma. She gives Dende a lesson that's very reminiscent of TheTalk Only for him to ask what a woman is.

[[folder:Comic Books]]
* The ComicBook/XMen have fought The Brood, a race of intelligent {{Captain Ersatz}}es of the creature from ''Franchise/{{Alien}}''. A human implanted with a Brood egg will eventually be physically (and mentally) transformed into a Brood member, and will retain any genetic-based abilities (e.g. mutant powers) the victim had.
* In Creator/PhilFoglio's ''ComicBook/BuckGodotZapGunForHire'''s "The Gallimaufry" storyline, a male alien Pog member named Qvakk states that he loved Oort, another male of his species/race, and was "gonna take him home, make lots of eggs".
* Transformers in IDW's ''Transformers'' comic have a truly bizarre reproductive cycle that doesn't even involve sex of any kind. There are "hot spots" on Cybertron and its moons where [[OurSoulsAreDifferent sparks]] form and are then "ignited" by an energy pulse from Vector Sigma, the life-giving core of Cybertron. This is known as 'forging'. Once the sparks are lit they are carefully removed from the ground and placed within a special kind of incubator known as the 'protoform', which it merges with. It then begins to take a form usually based on the person whom it has the most contact with as a protoform, and rapidly begins to develop the parts it needs for its future alt-mode. This all takes less than an hour, and the development from 'sparkling' into a full-size adult takes about two weeks.
** They can also artificially reproduce through "cold construction," which involves surgically removing a portion of the spark from another cybertronian and using it to grow a new one. There was much [[FantasticRacism bigotry]] towards cold constructed bots in Cybertron's old days (to the point of there being a cybertronian apartheid) as they were seen as blasphemy towards [[RobotReligion Primus]] but it's more or less died out after the Great War.
** This trope is also deconstructed; this form of reproduction is so bizarre and impractical that when the life-creating pulsewaves from Vector Sigma started dwindling to a stop, it put the cybertronian race in serious concern about the future of their existence. By the time of the comics all of the hot spots on Cybertron have stopped creating sparks (there ''are'' hot spots on some [[LostColony metrotitan-created colonies]] but it's not said if they're still working). This, alongside the Great War, has greatly reduced the cybertronian population, making them an endangered species in galactic terms.
** We later learn in ''More Than Meets The Eye'' that cold construction [[spoiler:actually involves taking essence from the Matrix (an ancient artifact) and using it to grow sparks in a lab, making transformer biology even ''weirder''.]]
** The G2 comics feature an BigBad who wants to return Transformers to their original reproduction method of budding off of each other.
* In an issue of ''ComicBook/BlueBeetle'', Jaime Reyes, having been teleported to Reach space, hitches a ride back to Earth with a space smuggler called Moonrunner. He suggests that they shake hands and agree not to betray each other, but Moonrunner refuses because he doesn't "like [Jaime] that way", at which point the scarab informs Jaime that Moonrunner's species reproduces by shaking hands.
* ComicBook/{{Venom}}'s species, the Symbiotes, reproduce asexually by having each individual spawning a child once in its life. Venom gave birth to ComicBook/{{Carnage}} that way, while Carnage himself gave birth to Toxin later. However, each Venom has several "seeds" capable of producing more Symbiotes which were artificially extracted and grown from it by the Life Foundation to make Riot, Phage, Lasher, Agony, and Scream. It's currently unknown if reproducing these seeds naturally is possible.

[[folder:Fan Work]]
* Disturbingly enough, there is a lot of LOTR fanfic in which elves have bizarre reproductive anatomy. The women have tiny, tube-like tentacles, that suck the sperm out of the males - and it is compatible with human anatomy, making the fics fit seamlessly into the Tolkienverse. It also gives a somewhat disturbing explanation as to why there is no fertile male elf-female human couple known in the history of Middle Earth.
* In Lantern Prime, Cybertronians have two forms of reproduction; Vector Prime produces Protoforms (a.l.a. Beast Wars) which have to be initialized by one to five other Cybertronians, taking on aspects of all the parents. And they also have two genders, female Cybertronians (called Makers) are very rare, and can interface with a male Cybertronian, splitting off a part of each partner's [[OurSoulsAreDifferent Spark]] and gestating it until it becomes a new complete Spark, at which point is is transferred into a new body built by the Maker.
* Cui in ''WebVideo/DragonBallZAbridged'' explicitly states that his kind "reproduce asexually". Everyone who knows that factoid is disturbed by it, and Dodoria helps Zarbon remember who Cui was (after Vegeta killed Cui) by stating the fact.
** Kicking a [[spoiler:primitive Saiyan]] in the stomach impregnates them.

[[folder:Films -- Live-Action]]
* The Xenomorph lifecycle in ''Franchise/{{Alien}}'' goes roughly as follows:
** Queen lays eggs
** Egg waits for host (Human, Predator, Dog Etc) to come by
** Egg hatches, facehugger crawls out, [[FaceFullOfAlienWingwong jumps on host's face]].
** Facehugger hangs on to host's face for day or two, host unconscious, facehugger keeps Host alive but tightens tail around neck if attempt to remove facehugger is made.
** Facehugger lets go and promptly dies.
** Host acts normal for another day or two (may/may not be aware of pregnancy).
** {{Chestburster}} [[ExactlyWhatItSaysOnTheTin bursts out of chest]], with some of host's DNA (eg; Chestburster from dog becomes quadripedal drone instead of bipedal drone).
** Chestburster quickly grows up into either Drone or Queen.
** If Queen, cycle starts again.
* Although not actually alien, the creatures from the ''Film/{{Tremors}}'' series have a bizarre life cycle that qualifies for this trope. Eggs hatch into dog-sized "dirt dragons", which transform into bus-sized "Graboids"; multiple bear-sized "shriekers" (each capable of rapid parthenogenesis) burst from the mature Graboid; mature shriekers pupate, then emerge as "ass-blasters", which lay eggs. It's unclear whether there's any actual sex required at all.
* In ''Film/KPax'', [=K-PAX=]ians are known to have a very painful mating experience, "like having your nuts in a vice, but all over". The process also involves nausea and a terrible smell.

* ''Franchise/StarWarsExpandedUniverse'':
** Khomites can only reproduce by cloning. They also only eat dietary supplements.
** And Selonians have one fertile female and a handful of males per 1,000 births. They're subterranean mammals; the queen and the males - presumably not from the same colony - basically do little but breed while the rest of the colony runs civilization. A little like naked mole rats. Humans and Selonians can apparently be allergic to each other. Or at least Corran and that one Selonian were.
** Falleen pheromones work on anything in the galaxy.
*** And Dathomiri women can use the Force to arouse men and then [[DoubleStandardRapeFemaleOnMale you know the rest]]. Teneniel does this to Luke. While he doesn't like it, he still talks to her afterward.
*** Zeltrons, [[GreenSkinnedSpaceBabe Pink Skinned Space Babes]] that they are, have a sexual attraction to Force-sensitives. If there's one thing the ExpandedUniverse has driven home, it's that a ''lot'' of people have been attracted to Luke even before he married [[HeroesWantRedheads Mara]] - though for his part, he was [[CelibateHero politely disinterested]] in most of them.
* ''Literature/{{Animorphs}}''
** [[PuppeteerParasite Yeerk]] are implied to have NoBiologicalSex, but have a form of sexual reproduction: three individuals fuse into one, which then disintegrates into hundreds of "grubs" which develop into baby Yeerks. (Occasionally one grub will turn into twins.) The Yeerk parents die in the process.
** The Skrit Na are even stranger. The "Skrit" look sort of like giant roaches and are fairly stupid. At some point during their lives they spin a cocoon, die, but then out of their dead body a Na (basically [[TheGreys a Grey)]] pops out. It's never explained where new Skrit come from, but the Na certainly have a weird way of coming into this (or some other) world.
* From ''Literature/{{Everworld}}:'' male Hetwan, though usually little more than perfectly obedient drones for their [[EldritchAbomination deity]] Ka Anor, will immediately go nuts and mate with any female they see, which looks like a [[{{Squick}} living collection of guts]]. A collection of eight to ten offspring are born immediately---which is good, because the males rip the females to pieces [[DeathBySex while having sex]].
* Though they can breed perfectly fine with humans, Martians in the ''Literature/{{Barsoom}}'' series lay eggs for some inexplicable reason[[note]]well, it's ''explained'' as an evolutionary adaptation; what's ''not'' explained is how they can interbreed with humans despite this fairly fundamental reproductive incompatibility, how the egg ''increases in size'' during its five-year incubation period, and why on Barsoom the females still have mammaries[[/note]]. Yes, even the {{Half Human Hybrid}}s.
* Creator/LarryNiven's ''Literature/KnownSpace''
** When asked, the Puppeteers say they have three sexes, but its not quite accurate. What they have is a "sperm depositor" male, an "egg depositor" male, and a non-sentient "female" (actually a different species that reproduces among themselves in a different way) called a "Bride". The Puppeteer ovum is deposited in the flesh of the Bride, the egg is then fertilized, and when the egg hatches, the infant puppeteer eats its way out of the body of the "female", like a digger wasp. In the ''Fleet of Worlds'' novels, it's revealed that this is ''invariably'' fatal to the Bride.
** Actually, pretty much all species in Known Space other than humans (and other hominids) and dolphins have a pretty thin time of it when it comes to sex. It's kind of Niven's trademark. It's likely that the Moties, who die if they don't get pregnant, were Niven's idea rather than Pournelle's.
** The hominids of ''Literature/{{Ringworld}}'' kind of make up for it by having robust interspecies sex a regular part of trade and politics.
** See also the Fuxes (below).
* The ''Literature/DoctorWhoNewAdventures'' novels suggest that Time Lords are all sterile and are "born" from a "Loom", a machine in their giant sentient semi-organic family Houses. Each Loom weaves Family members according to a common template, ensuring that they're related; every Family member is a genetically a cousin to each other.
* The Pequeninos of ''Literature/SpeakerForTheDead'', the sequel to ''Literature/EndersGame''.To reproduce, [[spoiler: the male has to be ritually vivisected to turn into a tree. Infant females are brought to the Fathertree and crawl around on its bark, absorbing sperm through its dust. Also: any female that survives to adulthood is completely sterile; the young ''eat'' their way out of the infant mother's body. Both male and female young are nursed in the Mothertree, which is what happens when a sterile adult female turns into a tree, which exudes a highly nutritious sap the young feed on until they're large enough to walk around on the ground]].\\
In fact, ''all'' native life on the planet is like this [[spoiler:(for example, there are no male herd animals--''the grass they graze on'' fertilizes the females). They were changed by a virus, brought to their planet by other alien species. [[DepopulationBomb All species who didn't develop bizarre reproductive cycles died.]] ]]
* Creator/VondaNMcIntyre's ''Starfarer'' series has the [[StarfishAliens squidmoths]]. The juveniles exchange gamete packets with each other and keep the packets they receive (the packets can stay fresh for a ''long'' time). At some point the juvenile consciously chooses to undergo a metamorphosis, consumes the collected gamete packets, lays fertile eggs, and dies.
* The alien city dwellers from ''Literature/BlindLake'' have two stages in life. The sentient adult form is neuter and has a special feeding apparatus which the parasitic larval form require in order to survive. It's the larvae that actually do the breeding. On occasion, a larva is infected by the virus present in the adults and will transform into an adult itself.
* The mantis-like Ki! from ''Chess With A Dragon'' are hermaphroditic parasitoids, who implant eggs in "host-grubs" of various non-sentient species [[spoiler: including feral human children they only think are dumb animals]].
* One of the ''[[Franchise/StarTrekNovelVerse Star Trek: The Captain's Table]]'' books presented the Anjiri and the Nykkus, two species of [[TheReptilians [=Reptilians=]]] whose gender (female, male, neuter) was determined by the temperature at which their eggs were incubated. Originally, they were presented in a fairly straightforward PlanetOfHats way- the Anjiri were matriarchal, with the females running the planet and the males being basically incompetent Space Pirates; the Nykkus were initially presented as a sort of HenchmenRace to the Anjiri. It later turned out that [[spoiler: the Nykkus and Anjiri are actually one species with two forms; females of either "species" in fact lay eggs for both, apparently regardless of whether their mates are Nykkus or Anjiri. All the Nykkus shown in the original appearance were "Coldborn" (neuter and not very bright); the male and female Nykkus shown later have little interest in working for the Anjiri, although the females are a lot better disposed towards them.]] Oh, and incubation temperature also determines, or at least strongly influences, both intelligence and physical strength (with females being the strongest/smartest for each race).
* The Phagors from the ''Literature/{{Helliconia}}'' trilogy have a cyclical libido, such that males are compelled to mate once every few days. They barely ever think about sex otherwise, yet the fact that such matings are conducted without any pretense of privacy, just as a human might sneeze in public, leads most humans to consider them lustful perverts.
* The life cycle of the Tyr in ''Literature/TheMadnessSeason'' proves important to the plot of the book. [[spoiler:Their homeworld has a century-long highly elliptical orbit. At the closest approach, the Raayat-Tyr, which serve as drones, return to the homeworld and fight each other through the hive in an attempt to reach the queen. A Raayat who mates with the queen will be killed. But, if the Raayat kills her, he will transform into the new queen.]]
* There is a lot of this is Creator/PiersAnthony's ''Literature/{{Cluster}}'' series; every species has a different, exotic way of breeding, and of course the hero, as he {{Body Surf}}s between the species, [[BoldlyComing experiences them all]].
* The Rozes, troll/giant hybrids from the ''Literature/GarrettPI'' series, claim to be "triplets with different mothers". Garrett has never been inclined to ask for details, so we don't know if it's this trope or a cultural thing.
* ''Medea: Harlan's World'' was a collaboration between a number of major SF writers to create a single setting, and a series of short stories set on the titular moon. In ''Flare Time'' by Creator/LarryNiven, the reproductive cycle of the native sentients known as fuxes is described. They start off as six-legged females. At around seven they have their first litter, during which their rear body segment tears off, leaving them as four-legged females. The hindquarters contain the eggs, and function as a nest which the newborns eat their way out of. Around seventeen they have a second litter, leaving them as two-legged ''males'', with the male organs exposed through the loss of the second body segment. The male guards the nest until the young are born, then goes into heat for about three years, and eventually ends up a 'post-male'.
* Between their advanced knowledge of the universe, their shape-shifting nature and the wide-range of powers they are able to borrow from each other, the Gods and Demons of ''[[Literature/DivineBloodNovels Divine Blood]]'' are capable of this even if it's not their normal choice. They are canonically capable of:
** HomosexualReproduction
** Creating [[ArtificialHuman homonculi]] out of two or more genetic samples.
** Nonsexually inducing pregnancy (willing or otherwise).
** MisterSeahorse
** And they also accept Transhuman recruits into their ranks. Lilitu Geisthexe notes that former humans outnumber Immortals with [[MixedAncestry both God and Demon heritage]].
* The mental patient "prot" from the novel series ''Literature/KPax'' describes the [=K-PAX=]ians' mating process as being extremely unpleasant, involving profound pain, nausea and a potent terrible smell. The books tie this in with a kind of ImmortalProcreationClause -- since the [=K-PAX=]ian lifespan is over a thousand years, combined with the unappealing mating process, there's no problem with either under OR overpopulation.
* The [[SpaceElves Lo'ona Aeo]] in Creator/MikhailAkhmanov's ''Literature/ArrivalsFromTheDark'' series have four sexes. Their approximate names are male, female, half-male, and half-female. Half-females are sterile and don't participate in the reproductive process. Males and half-males join their minds with females, which starts the "mental contamination" process and impregnates the female without actual physical contact. The resulting child's personality is based on all three parents. Until their maturity, Lo'ona Aeo can artificially induce a slightly different sex on themselves using medical means (e.g. an immature half-female can make herself a female). Reproduction is directed by the heads of extended families in order to prevent unwanted genetic branches. Thus, they may force a female to become a half-female in order to cut off any possible offspring from that line.\\
The novels describe a unique case of a human male (descended from a human-[[HumanAlien Faata]] hybrid) using his latent telepathic abilities to accidentally "mentally contaminate" a Lo'ona Aeo female. Her son ended up lacking the extreme xenophobia that all Lo'ona Aeo have and becomes an adventurer (a quality inherited from his father). Since Lo'ona Aeo live for over 1000 years, he has encountered several of his father's human descendants.
* ''Literature/TheStormlightArchive''. Little is known about the reproductive process of the Rosharan chasmfiend, but one stage seems to involve the creature climbing up onto a plateau, spinning a vaguely insect-like cocoon out of what is basically cement, and waiting for one of the storms that come along every few days. Presumably, they need the {{Mana}} the storms carry to fuel the transformation to the next stage of their cycle. In the second book, Shallan points out that since the Alethi have been slaughtering pupating chasmfiends on a massive scale for the past six years, they're dealing huge damage to the ecology of the region, and it's not sustainable.
* The Hosts in ''Literature/{{Embassytown}}'' have a cycle that's skimmed over, but there is an initial aquatic phase of life, where the young Hosts are referred to a "elvers", a terrestrial phase where young play and fight, middle age and sapience, and their final phase, lumbering and nonsentient. They evolved to reach that phase and wander mindlessly after younger Hosts who at the time would eat them, but modern civilized Hosts, with no need of that, abhor the idea and treat elders kindly until they drop.
* ''Literature/TheColorOfDistance'''s Tendu hatch in great numbers as tadpoles or narey. Eventually they metamorphize into froglike tinka, and live in the forests for a time until going into a village and acting as servants. Some tinka are chosen and treated to transform into bami, able to speak and reason and somewhere between children and apprentices. Bami, when those they were chosen by die or are exiled, are transformed again into sexually mature elders. Rarely elders will choose to become enkar, but this last stage is more a cultural than physical change. All levels eat some of the plentiful fertilized eggs and narey, and few tinka are chosen so that most die of animal attacks or old age, in order to help keep populations down.
* Since StarfishAliens in ''Literature/StarCarrier'' are the rule not the exception, it stands to reason that this trope is played straight most of the time. The described examples include the Agletsch and the Grdoch:
** The Agletsch appear to be InsectoidAliens but are not. The spider-like individuals are all female. Their males are [[BizarreSexualDimorphism small non-sentient grubs]] that the females keep attached to them at all times. When the time comes, the males fertilize the females.
** The Grdoch look like large balls with senses and mouths all around. Each Grdoch acts as both parents, fertilizing itself. The young are born inside and stay there until they sense distress in their parent, at which point they pop out and try to get away. The Grdoch lack any paternal feelings towards their young and frequently used them to distract larger predators or even as a light snack. In space, small, chaotically bouncing shapes can prove to be a hazard on any ship, but the Grdoch haven't found any way of preventing that, especially during battles, where the stress causes such "births".
* The main alien race in Creator/GregEgan's ''Literature/{{Orthogonal}}'' trilogy is a gold mine for this trope.
** Sex immediately induces reproduction; there is no gestation period.
** Sex consists of two of the {{Shapeshifting}} aliens melding the flesh of their chests, through which the male transmits a light-based signal into the female's body to induce the reproductive process. No actual matter or bodily substance is exchanged; genetic diversity is ensured through the infrared transmission of "influences" by ''every'' individual to ''everyone around them'' -- which, incidentally, is also how diseases spread.
** Females reproduce by splitting into four children; two sets of male-female twins respectively referred to as cos, who are genetically ideal mates for each other. The children who are not cos to each other are referred to as brothers and sisters, but the same terms are generally not used to refer to cos, probably to avoid implying that the relationship between cos is BrotherSisterIncest.
** In the rare event that a woman is born without a co [[note]]known as a solo; [[AlwaysFemale all solos are female]], and solos are generally much larger than the average individual, leading to the scientifically discredited but pervasive idea that solos [[FetusTerrible eat/absorb their cos during childbirth]][[/note]] or is otherwise unable or unwilling to mate with her co, she can instead reproduce with another willing male, known as a co-stead. These relationships are treated more as a husband/wife relationship than the relationship between cos. It's considered a kind of reproductive UndesirablePrize, generally resorted to only when one co is dead or nonexistant, but there are occasional exceptions.
** Under the right circumstances, primarily old age or spending too much time away from their co or co-stead, spontaneous reproduction is common enough to necessitate women taking a drug to prevent it.
** In ''The Eternal Flame'', things get even WeirderThanUsual: A woman fasting to the point of near-starvation helps to both stave off spontaneous reproduction as well as to ensure that, when it happens, it [[spoiler: will result in only one pair of cos instead of two, for PopulationControl]].
** And even weirder [[note]]or, depending on your perspective, completely and utterly normal[[/note]]: Near the end of ''The Eternal Flame'', the biologist half of the EnsembleCast develops a way to [[spoiler: induce childbirth that produces only one child, does not kill the mother, renders her sterile for the purposes of traditional (fission) childbirth, ''and'' is shown to be repeatable in the final book, ''and'' can produce male children. In other words, they can more or less reproduce [[NotSoDifferent just like us]]]].
* The Nac Mac Feegle in ''Literature/{{Discworld}}'' has one female to a tribe, who is the Kelda and is married to the most powerful warrior. [[WomenAreWiser It's her job to do the thinking for the entire tribe]] and, although she's their ruler, she's also, in a way, a prisoner. Female births are very rare and girls are expected, upon reaching adulthood, to either find a tribe whose Kelda has recently died or collect a few men from nearby tribes to form a new tribe. In either case, she takes some of her brothers with her to keep her company until she gets to know her new people. Incidentally, Creator/TerryPratchett was quite interested in bees and their swarming behaviours.
* The ''Literature/{{Torin}}'' series is a low-key example; most of the visible mammalian species on Torin are marsupials, including the local sapient humanoids, who carry their infants in pouches for the first few months after birth, and are initially horrified when a visitor from Earth attempts to describe how his people carry their babies entirely enclosed within the mother with no apertures for air to get in.
* Gethenians in Literature/TheLeftHandOfDarkness are usually asexual and [[NoBiologicalSex genderless]], but go through a stage each year called kemmer, lasting about 25 days. While in kemmer a Gethenian will become either male or female with no control over which sex they take, unless they use certain chemicals. During kemmer their body is essentially in a state of MateOrDie, so incest during this time is generally not frowned upon, certainly during pubescence, unless it becomes a romantic attachment. They might "keep kemmer" (have a long-term partner) or "vow kemmer" (the equivalent of marriage), but the vast majority of Gethenians are polygamous during kemmer, and most openly visit kemmer-houses to mate with whoever else happens to be there.
* The ''Literature/MyTeacherIsAnAlien'' series makes mention of a species that requires "five genders to produce an egg, and another three to hatch it". It's a kids series, so we aren't given any details on how this works.
* LesXipehuz: The Xipéhuz, being the first example for BizarreAlienBiology and StarfishAliens in literature, naturally display this. Every solstice and equinox, they gather in groups of three, merge into some kind of ellipsoid and stay this way over night. The next day, they part and leave giant smoky forms which become denser and form into cones much bigger than the adult Xipéhuz before shrinking into their adult forms.
* In {{Robert J Sawyer}}'s ''Illegal Alien'', the Tosoks' females have four wombs, so that group sex is the norm for them, with four males impregnating each. Half-siblings are also far more common as a result. Occasionally though just one male inseminates all four of a female's wombs. Their term for God possibly even reflects that-one human, learning about all this, reflects how they thought the Tosoks were saying "Foremother" but it may have really been "''Four''mother".

[[folder:Live-Action TV]]
* ''Franchise/StarTrek'' has plenty of examples, having [[LongRunners been on TV for so long]]:
** The Vulcans have "Pon farr", a mating season every seven years, where they must mate or die. Alternatively they can beat another competitor to their desired mate to death, which is just plain weird.
** Xyrillian females can impregnate human males without the human noticing. The one time this happened in the show she hadn't been aware this was possible. They technically reproduce asexually; the "male" Xyrillians don't contribute any DNA to the process, they just carry the female's child.
** The Q can choose to have sex by touching fingertips, but being nigh-omnipotent that's not saying a whole lot we don't already know from the "omnipotent" label.
** The Varro mate for life, and to ensure this they intermix their body chemistry, causing symptoms of physical withdrawal if a mate leaves.
** All we know about Klingon sex is that it's not uncommon for both partners to break bones. Ow. A broken collarbone on the wedding night is a sign of good luck. Of course, given how [[ProudWarriorRaceGuy Klingons tend to act]], that might simply be a cultural tendency towards ''very'' rough sex.
** 90% of Taresians are born female. They claim to reproduce by implanting embryos in the wombs of females of other species, but the child will be fully Tersian. The truth is even weirder: They spread a retrovirus that turns males of other species into pseudo-Teresians, and then he's driven to return to the planet where they'll extract his DNA, fatally.
** Female Ocampa go through "Elogium", a puberty-like stage where they can successfully conceive a child (in a growth on their back), but it only happens once. Also leads to a very large bit of FridgeLogic, every Ocampa female can only conceive once, and multiples births seem to be rare to non-existent... so if every female Ocampa can only produce one child in their entire life... how is the species not extinct already? The FridgeLogic factor of Ocampan reproduction goes far further than that: Despite only being able to reproduce once and only living for nine years, the females have constantly engorged breasts. The reason why humans have breasts and dogs don't is because we can reproduce whenever we feel like it - there is no biological reason why they should grow breasts a good ''four'' years before they can conceive. Secondly, they reproduce through a bizarre system of massaging feet and gluing their hands together ''for an entire week'' using a thick, sticky mucus - in the wild no creature could do this without being eaten by predators. This would logically mean both the males and females have nothing between their legs and are around about the same size - if this was real life and not being played by human actors and actresses the only way to determine a male from a female would be those anomalous breasts.
*** The "one mating = extinction" dilemma, at least, can be resolved if Ocampa are a sperm-sequestering species, such that one mating provides the male genetic contribution for multiple pregnancies over the female's lifetime. If said subsequent pregnancies happen in quick succession, the constantly-engorged breasts would make sense too: they don't have time to shrink between babies. However the only example we have of an Ocampan family is the alternate future from [[Recap/StarTrekVoyagerS3E20BeforeAndAfter one episode]] where Kes had one daughter in her lifetime and the daughter also had only one child.
** The J'naii are supposed to be genderless (although they all look similar to female humans). However, nothing about J'naii reproduction makes any sense, as the script muddles together three totally different kinds of genderlessness. The asexual cast to their society would make sense if they reproduced by cloning, but they do reproduce sexually, in which case being a One-Gender Race should make their interactions more sexual, not less. The persecution of those who prefer a gender would make sense for a race of hermaphrodites (where everyone is both sexes simultaneously) but their sex act is described as a precisely symmetrical affair (i.e. the J'naii are all one single sex—they're isogametes.) An isogamete preferring one sex over another makes about as much sense as a Cyclops preferring one eye over another.
** Denobulans have a mating season, and their breeding drive is regulated by powerful pheromones generated by their females. Males can become violent under these pheromones' influences. Culturally, they practice group marriage, and also remain promiscuous outside such formal relationships.
** The Kobali resurrect, and genetically alter, the corpses of other species.
** Andorians, as revealed in the expanded universe, have [[BizarreAlienSexes four separate genders, all of which are needed for reproduction]]. Deconstructed in that this is revealed to be causing their genetic diversity to break down; by the time period covered in ''Literature/StarTrekDeepSpaceNineRelaunch'', they're a DyingRace with extinction predicted within fifteen generations. And ''that'' is being ''optimistic''. There is actually a scientific movement underway looking to retro-engineer them back into being a two-gender race, which is [[ScienceIsBad meeting severe opposition from many Andorians]], as the four-gender quartet is an integral part of their culture and religion.
** And then there's ''Series/StarTrekDeepSpaceNine'''s often mentioned but never seen Lieutenant Vilix'pran, who on several occasions was said to be "budding" -- a process which, according to various bits of related dialogue, can produce from two to twelve hatchlings and requires a ''pond''.
* ''Series/BabylonFive'''s Centauri have six prehensile tentacles for sexual organs, which are flexible enough to (as Londo demonstrated in a first year episode) snake under a poker table and pick up a card on the other side of the table. Centauri women have six corresponding slits on their backs. What drives this into BizarreAlienReproduction rather than it simply being ExoticEquipment is that the amount of pleasure from intercourse goes up for each tentacle/slit used, and use of all six is required for conception. One imagines that Centauri orgies are as decadent as their civilization as a whole (think, you could have hundreds of participants and absolutely ''no'' risk of pregnancy for ''any'' of the women)....
** There's also the Pak'ma'ra, for whom the only reproductive information mentioned in-show is that the "hump" on their backs is actually their reproductive area. ([[WordOfGod According to Usenet postings by the creator]], female Pak'ma'ra are tiny, non-sentient beings who live inside said hump.) Finally, in one episode Ivanova tricked one alien into believing that a strange dance (with nonsensical chanting)--which seem to be an abbreviated script for a one-night stand--and rubbing of hands was [[InvertedTrope Bizarre Human Reproduction]]. At the end of the episode, Ivanova is left a gift by the alien: A trinket of some kind and a note saying "next time ... ''my way''."
* In ''Series/AlienNation'', ''three'' Newcomers are required to make a baby: a male, a female, and a binnaum who catalyzes the impregnated female. Part way through the pregnancy, the female [[MisterSeahorse transfers the fetus to the male]], where it slips inside his belly somehow and attaches an umbilicus to one of the male's nipples. It is the pregnant male who gets to have the wacky BornInAnElevator scene at the end.
* In the original ''Series/{{V 1983}}'' miniseries, Willie recognizes Robin is pregnant because she's developing a ring of discoloration around her neck, which suggests that such rings are normal for Visitor mothers-to-be. His comments imply the ring becomes more complete as the pregnancy progresses.
** In a sense, this is Bizarre in how normal the reproduction was. The Visitors are reptiles from another world posing as humanoids (presumably mammalian). Somehow Robin was impregnated through what appeared to be intercourse, just like it would be between humans.
* The ''Series/{{V 2009}}'' remake is a little strange. The normal V reproduction involves a queen (like Anna) mating with a male, after which she eats him for nutrients. She then lays hundreds, if not thousands, of fertilized eggs with one or two being "queen" eggs. While initially thought impossible, it's discovered that HalfHumanHybrids are indeed a possibility but may be more V than human. Only one was shown onscreen, the product of a [[HumanMomNonhumanDad V father and human mother]]. However, the final episode shows a queen V mating with a human and taking a bite out of him, implying she has been impregnated.
* TheGreys in ''Series/TheXFiles'' are capable of incubating inside a human host that has been infected with Black Oil. When the hosts gets hot enough, the alien hatches into a long-clawed, violent creature that desires more heat. Eventually, it sheds its skin to become a "normal" grey alien.
* ''Series/DoctorWho'': The Vespiform can mate with a human thanks to phase-shifting capabilities. ''Thanks to'' phase-shifting capabilities.
* ''Series/{{Torchwood}}'': Season 2 gives us the Nostrovite, in which the male carries fertilized eggs in their mouth, passes them on to a suitable humanoid host (and that makes the host look 9 months pregnant overnight), and then the female comes to claim the spawn...[[spoiler: by ripping it out of the host.]]
* In ''Series/{{Andromeda}} the Magog reproduce asexually, laying their eggs in a host which then eats the host from the inside.
* ''Series/{{Hyperdrive}}''. Before making FirstContact with an alien planet, the crew have to watch a {{squick}}-inducing InstructionalFilm warning them of the dangers of BoldlyComing.
-->''Let's learn about another Alien Sex Disease. This crew member had intercourse with a Glygonthian octopoid. Let's take a close look at his genitals. Pustules have developed. And on the pustules, warts. Soon his entire groin explodes revealing five baby octopoids, each with his face. Remember -- alien sex is danger sex.''
* In ''Series/RedDwarf'' XI, the Cat becomes host for eight polymorph babies. He is warned the morphlings will seek the nearest available orifice for birth. Cut to the Cat, naked, face-down and sweating as Rimmer, Lister and Kryten act as midwives. The Cat then endures giving birth - presumably anally - to things like a Rubik Cube with spiky corners, a very large beachball, a model cabin crusier with sharp prow, and a pineapple.
* ''Series/TheOrville'': Moclans reproduce by laying eggs, although they are male. [[spoiler: Or at least it seems that way to begin with...]]

[[folder:Oral Tradition]]
* TheGreys are apparently extremely interested in human sexuality for some reason, so we are ourselves a case of BizarreAlienReproduction, inverting this trope among UFO nuts.

* ''Radio/TheHitchHikersGuideToTheGalaxy''
** We're never told the details, but the Betelgeusians Ford Prefect and Zaphod Beeblebrox in share three mothers (with the implication that Zaphod at least has more mothers who they ''don't'' share), which makes them "semi-cousins".
** Ford's father "both fathered and uncled" him, which could mean Ford is the product of incestuous relations, or just more of this trope.

[[folder:Tabletop Games]]
* ''TabletopGame/DungeonsAndDragons'' includes multiple examples, mostly among the Aberration creature type.
** Illithid Elder Brains (composed of the disembodied brains of dead illithids) asexually produce eggs in pools of water. The eggs hatch into tadpoles that cannibalize each other until the survivors reach maturity. Mature tadpoles are inserted into living adult humanoids to devour and replace the nervous system. This results in an adult illithid.
*** Just to be clear, if an illithid tadpole somehow survives for long enough without a host, it doesn't die. Instead, it grows up into a Neothelid, which resembles a dragon-sized, slime-caked worm with a mass of tentacles for a face, psychic powers, and the ability to breathe acid. Illithids prefer not to talks about them.
** Beholders also asexually reproduce. After becoming pregnant, they gorge themselves until the fetuses become too large and pinch the esophagus shut. When the children come to term, the parent vomits up its entire uterus (which does not regenerate).
*** ''Volo's Guide to Monsters'' gives us another explanation: sometimes, a Beholder may create another Beholder (or some other creature) by [[{{Clap Your Hands If You Believe}} dreaming]].
* In ''TabletopGame/{{Infernum}}'', both the LegionsOfHell and the spawn (Hell's equivalent of animals) have this.
** Spawn reproduce by dying; when you kill a spawn, multiple smaller, weaker spawn of the same kind will emerge from the corpse within a minute or two. Kill those, and even more spawn that are even smaller will emerge, ad infinitum, until the resultant spawn is too weak to "divide" in this fashion any more and simply dies upon death.
** Demons, meanwhile, reproduce through Spawning Pits... which manage to be even ''less'' fun than they sound like. Spawning Pits are filled with alchemical acids that dissolve living demons, but catalyse their organs, causing anywhere from one to thirty-six "larvae" to chew their way out of the decaying husk. After about six months, these maggot-like creatures pupate inside cocoons and then emerge as demons of the same kind as their "parent".
** Making things even more bizarre: demons and spawn are related to each other. The first demons were born when fallen angels had sex with spawn.
* ''TabletopGame/{{Warhammer 40000}}'':
** Orks are partly fungus-based; they shed spores throughout their lives that can grow into any kind of Orkoid lifeform, and release a large number of spores upon death. They qualify as AlienKudzu in that every single Orkoid has the potential to grow into a full "[[{{Terraform}} Orkiformed" ecosystem.]] The only way to prevent this is by [[FireKeepsItDead burning the bodies]].
** Tyranid Genestealers implant genetic material in victims that causes them to form a cult-like devotion to the Genestealer and a drive to mate. Each generation spawned by the cult members will look less and less like a Genestealer until the fifth or sixth generation, which exactly resembles the host species. The next generation will then be "purestrain" Genestealers, and the cycle will start over.
** The fluff book ''Xenology'' hints that, while Eldar appear to procreate in the same manner as humans, males may have to make multiple deliveries of genetic material to fully conceive, as opposed to humans. The actual canonicity of this has never been established, though.
* Creator/{{Chaosium}}'s supplement ''All the Worlds' Monsters'' Volume III. The Scarlet Stalker captures human beings and inserts eggs into their bodies. The eggs keep the humans paralyzed until the eggs hatch and the young eat their way out of the body.

[[folder:Video Games]]
* The Galka in ''VideoGame/FinalFantasyXI'' are an all-male race who reproduce via a form of reincarnation. When a Galka is nearing the end of their current life through natural causes, they sense it and go on a spiritual pilgrimage to a high mountain and await their current life's end. According to Galkan beliefs, a magnificent light will appear and grant that Galka a new younger body, and seemingly fragments of the memories of their past life. No one else has witnessed this miracle, and no Galka recalls their personal experience of the matter, so there's some who believe it is simply folk lore. But there appears to be truth to it, because after a Galka leaves for their final journey, a new Galkan child arrives to the same Galka village within less than a year latter. No one however, is sure how Galkan's then replenish their numbers, due to death from violence or illness.
* ''Franchise/MassEffect''
** [[GreenSkinnedSpaceBabe Asari]] reproduction is based on 'melding'. During said process, the asari scrambles and changes up a DNA sample of her own, using the DNA of her partner, whatever sex and [[BoldlyComing (sentient) species it may be]], as a map/inspiration. The randomized version of the asari's genes is then combined with an unchanged sample of them for purposes of producing offspring. [[OptionalSexualEncounter Sexual contact is not required, but not uncommon]]. Even more weirdly, mating ''within their own species'' is discouraged in order to avoid certain extremely nasty genetic defects that can occur from such a union.
** Much more disturbing with [[spoiler:the Reapers, which melt down an entire sentient species into some sort of goo, which they mold into a new Reaper.]]
** Salarian females lay eggs throughout their lives, several a year. Fertilized eggs hatch as females, unfertilized ones as males. In order to keep from overwhelming their worlds, salarians only fertilize 10% of their eggs, using extremely complicated reproductive contracts to arrange who does what.
** Because of the incredibly lethal DeathWorld they're native to, krogan females are capable of producing thousands of offspring (it's never mentioned whether they lay eggs or give live birth, but given their generally reptilian appearance it's probably the former).
** The [[BigBad kett]] in ''Andromeda'' actually ''cannot'' reproduce; all sex organs on them are vestigial. So how are new kett made? [[spoiler:They transform members of other species into new kett via a highly painful process referred to as "exaltation". The Archon implies that they have assimilated over a thousand species into more kett.]]
* In ''VideoGame/{{Patapon}}'', you create new individuals by ''burying certain materials under a special tree''.
* In an old Maxis game, ''VideoGame/UnnaturalSelection'', genetically engineered creatures reproduce via "melting into a skin colored blob, combinating and laying a baby version of themselves" you can watch this [[http://www.youtube.com/watch?v=hin-DIVIeqE here]].
* ''VideoGame/{{Pikmin}}''. The tiny VideoGame/{{Pikmin}} apparently reproduce by bringing plant matter and insect corpses back to their hives/'onions', which spits out seeds that first plant themselves into the ground, mature for a while, and then get uprooted as new baby Pikmin. It is also possible that they require another creature (such as the player) to uproot them in order to enter their mobile phase and complete the cycle.
* ''VideoGame/GuiltyGear''. While it's AllThereInTheManual, Gears apparently lay eggs or the children come out in a protective cocoon they later hatch out of.
* One of Atrus's journals from the ''VideoGame/{{Myst}}'' games describe an other-Agely creature called a "ting", which seals itself in a rock crevice, from which a bunch of lizard-like "solastings" emerge a couple of months later. It's unstated how the solastings give rise to the next generation of tings.
* In ''VideoGame/{{Spore}}'', AlienAnimals dance together, then one of them lays an Easter egg (and then you can see if you have enough DNA stored up to tweak your critter for the next generation.)
* Chao from the ''VideoGame/SonicAdventure'' series reproduce when one Chao sits in a bed of flowers[[note]]which indicate fertility and ''follow the Chao wherever it goes''[[/note]] and is joined by another Chao, the two proceeding to [[GRatedSex nuzzle and dance]] until an egg containing attributes from the two appears between them. Most Chao enter the flower phase naturally with time, though it's possible to induce it by feeding the Chao some heart-shaped fruit.
* ''VideoGame/DwarfFortress''
** It has been suggested that many of the species reproduce via spores rather than in the conventional fashion, given the way that you can chain up members of different sexes at opposite ends of the fortress and still get offspring.
** A more deliberate design choice can be seen in the form of night trolls, [[SingleGenderRace single gender monsters]] who kidnap members of the opposite sex, [[TheVirus transforms them into "spouses",]] and proceed to reproduce in the normal way. The children are always the same sex as the night troll parent, and the spouse is often slain or simply abandoned (which inevitably means death at the hands of their former species). Notably, night trolls are happy to prey on elves, dwarves or humans, but goblins just don't do it for them.
* In the ''VideoGame/{{X}}-Universe'' the Teladi lay eggs that always hatch females if left unfertilized. For this reason space Teladi are effectively a OneGenderRace.
* Much like Xenomorphs, Chryssalids in ''VideoGame/XComEnemyUnknown'' plant their seed into living hosts by viciously murdering them and vomiting eggs into the corpse, which turns humans into shambling zombies. If a zombie is left alive for too long, it will burst into a newborn Chrysalid, identical in size to a "mature" one, but with lighter skin color.
** in ''VideoGame/XCom2'', the Evolved Chryssalids don't need to directly kill the host or even inject eggs in order to reproduce anymore, they merely need to poison the host. If the host dies while the poison is still in effect, they rapidly transform into an overgrown cocoon, which releases ''multiple'' newborn Chryssalids one at a time, three per corpse.
* While it's never shown how sex among ''Franchise/{{Pokemon}}'' works, some aspects of their reproduction are defintely weird:
** Every species is part of one or two egg-groups and could mate with any other pokémon of the same egg group as long as it's of the opposite gender, [[HotSkittyOnWailordAction even if there is vast size differences between the two.]] The offspring will always be of the female's species, but with some of the male's attacks.
** Ditto is genderless and could mate with any fertile Pokémon regardless of gender. The offspring is never Ditto, but always the other Pokémon's species.
*** The only exception is Manaphy, which will always produce a Phione-Egg.
** Some species are male-only or female-only, with the male-only ones only possible to produce same-species offspring being Ditto.
*** The only exceptions being the Nidoran-line and Volbeat/Illumise, where male and female are regarded as different species, but the female can produce offspring of the male species, even if her male is of a different species.
** Some species are genderless and only able to mate with Ditto.
** Some species cannot reproduce in-game, but some of them are seen to have eggs or babies in other media.
** Every species, even the mammal-based ones, lays eggs. But at least one species, Miltank, also gives milk.
** And the daycare-owner still doesn't know where the eggs come from. Some dialogue with [=NPCs=] even suggest that Pokémon eggs aren't even eggs in the biological sense and are more like "cradles"... Whatever that's supposed to mean.
** Nihilego, an [[EldritchAbomination Ultra Beast]], does not breed like regular Pokemon, but [[https://i.imgur.com/wMYYOh2.jpg Concept art]] shows that it breeds by spawning polyps that grow into larve and then adults. Basically it reproduces like a real jellyfish. Other Ultra Beasts have other methods of propagating that are different from the standard "male-and-female produce and egg in a daycare", such as Celesteela sprouting from the ground in its homeworld.
* Trials in Tainted Space is an [[PornWithPlot erotic]] SpaceOpera which has the player boldly going to new planets to earn their fortune while BoldlyComing into every alien they meet. While almost every alien has average human genitals the Nyrea have some thing far different. The males lack penises, instead they have sperm sacs inside a cavity in their hips. The [[OneHeadTaller larger]] female uses her spiked ovipositor, a organ that looks like a horse penis with spines at the tip, to rend the sperm sacs and suck up the sperm to fertilize her eggs. If the female is an alpha of her group, she will make a lesser female gestate her eggs. Yeah.
* ''VideoGame/{{Starbound}}'':
** The Glitch is a race of robots made to simulate evolution. Part of their programming is an inability to realize that they aren't ortganic beings (though now and then a Glitch manages to break past the blocks), so they have a lot of internal blinds, including when reproduction is concerned. When a Glitch couple decide it's time to start a family, they retreat to their bedroom. They then enter a trance-like state and proceed to a secret workshop none of them are consciously aware of, where they assemble their new offspring. Upon completion, they leave the workshop and return home, after which they snap out of the trance. They will have no memory of the event, but are convinced that it was "very pleasant".
** The Floran are a race of plants and are technically genderless beyond cosmetic details. While nothing canonical is clarified about their reproduction, their respawning animation shows a seed sprouting into a pod that opens to release a reborn Floran. Early beta versions also had "Floran pods" planted in fields. Presumably, the Floran reproduce by pollination leading to seeds that are planted and produce offspring without internal gestation.
* ''VideoGame/XenobladeChroniclesX'':
** The Orphe are a vaguely insect-looking species that reproduce asexually. The method is by sprinkling some "senirapa" water upon themselves (even a single drop will suffice), which causes their body to spontaneously generate two new Orphe. The children possess all the memories of their parent. It is common for dying Orphe to do this as their final act, to ensure that their memories and experiences will not be lost, but the game suggests that they can do it at any time they please, as long as they have some of the water on hand. And this is before one Orphe randomly undergoes a mutation that leads to the sudden birth of the first female of their species.
** The Zaruboggan seem to be a OneGenderRace, and also reproduce asexually. The precise method isn't gone into, but the word they use for producing a child is "[[{{Squick}} regurgitation]]".

[[folder:Web Comics]]
* Uryuoms from ''Webcomic/ElGoonishShive'' have this in ''spades''. They have one sex (but identify as male or female if in a society that recognizes gender, like the USA). It normally takes two individuals to make an egg, made by secreting a certain substance - it takes two only due to the amount needed. Once the egg (which looks like a meteor) is formed, it lacks any DNA of its own. DNA of ''anything'' can be put in (through the openings that make it look like a meteor), and it will naturally create a new viable chimeric being inside it. Any number of sources can be used, (the current record is twelve). There need not even be an Uryuom as one of the genetic parents! Basically, they reproduce via a genetic engineer's wet dream. [[spoiler:And yes, some genetic engineers have noticed.]]
-->***Nanase:*** What ... ethnicity ''is'' Grace, anyway?
-->***Tedd:*** Mixed. Very, ''very'' mixed.
* ''Webcomic/{{Homestuck}}''
** Trolls reproduce by "mixing genetic material"[[labelnote:*]]implied to be via sex, but the open audience of the comic limits a direct answer, letting the [[RuleThirtyFour audience's imagination run wild]][[/labelnote]] with their lover and [[FoeYay their archenemy]] in separate pails, and then giving the material to a drone. Gender is irrelevant to reproduction. All of the combined material is then basically mixed together, and a mother grub takes the best material and lays eggs for the whole species. As said in the comic, [[LampshadeHanging Trolls sure are weird!]] The FridgeHorror of this comes from the fact that trolls arrive at sexual maturity around the same time as humans do, and are at the same level of emotional and mental security. These are kids put to work sexing it up the second they are capable of "producing genetic material", and they have no idea what the hell is going on.
** This has the side-effect of making pails (and pictures thereof) NotSafeForWork among trolls, as seen [[http://www.mspaintadventures.com/?s=6&p=004600 here]][[labelnote:*]]note that Rose can be seen on the viewscreen with a bucket on her head[[/labelnote]]. This lead to a [[MemeticMutation meme]] among ''Homestuck'' fans in which they react to any depiction of a pail or a bucket as extremely lewd and sexual, which in turn also makes [[http://www.youtube.com/watch?v=4GOh18uZBlw&feature=player_embedded this video]] completely unintentionally hilarious. The mind boggles at what they might make of [[Discworld/LordsAndLadies the Lancre Stick-and-Bucket Dance]].
** ''Universes themselves'' have a bizarre means of reproduction, which involves {{Stable Time Loop}}s, [[TheGamePlaysYou a video game which manipulates reality and draws the players into the game]], a war between anthropomorphic chess pieces [[BecauseDestinySaysSo which one side is always destined to lose]], and sped-up frog breeding.
** [[spoiler:Cherubs]] are even weirder than trolls. [[spoiler:They can only mate with rivals, by a ritual where they typically go onto a black hole and turn into enormous, near-indestructable ''[[ScaledUp snakes]]'' that can only be harmed by one-another. Whoever loses the battle is impregnated with the young, and the CharacterAlignment of [[SplitPersonality each child]] depends on which parent carries the young.]]
** [[spoiler: Leprechauns]] are possibly weirder than [[spoiler: cherubs]], although we've been spared the details. Their bizarre alien ''romance'' involves [[spoiler: combinations of nine emotions, one of which equates to human love or troll matespritship, and most of which involve [[TheTrickster pranks and riddles]]. Unlike the four "quadrants" of troll romance, ''any'' of these relationships could lead to reproduction, following a "mating jig".]] Oh, and they seem to be a SingleGenderRace.
* Sam Starfall from the comic ''Webcomic/{{Freefall}}'' is a Sqid. Only a small number of Sqid are fertile, and those breed early. Upon breeding, both the male and female die. A litter of young is born and, Sqids being scavengers, the Sqidlings have a ready-made food source. Other adults come along and pick Sqidlings to raise (a process described as being like picking a puppy). These "Mentors" raise the young Sqid in their race's ideals of chicanery and stealing everything not nailed down or on fire.
* ''Webcomic/SchlockMercenary''
** The title character is a [[BlobMonster carbosilicate amorph]], essentially a race of organic data-storage systems turned sentient. They typically reproduce by splitting off a part of themselves that contains their personality, and merging it with that of another. On top of that, due to the "sentient data-storage" bit, it's also possible to reproduce with non-amorphs through a period of observation - [[http://www.schlockmercenary.com/2003-03-20 a process Commander Kevyn compared to marriage.]] On top of ''that'', two amorphs battling it out usually results in, rather than one or both parties dying, a single amorph with merged personality traits of both combatants.
** Also in this 'verse are the Qlavo, who ''conceive'' normally with males and females, but hand off responsibilities of development to a third gender, muftales.
** This goes on, as a whole [[http://www.schlockmercenary.com/2004-06-05 rather more]] than we see.
* Allow [[MadBomber Volaster]] [[PlayingWithFire Jarvoc]] explain to you how [[OurDemonsAreDifferent demons of Asgard]] reproduce in Webcomic/HeartCore:
--> "...a demon never truly dies...but they never truly reproduce either. It's rare, but when a demon decides to renounce their life, an egg with their reincarnation appears...This egg will also have attributes from another demon they've been in contact with. Within two years' time, the new demon will require the originator's Heartcore, effectively relieving them of duty."
* In ''Webcomic/{{Outsider}}'' the Umiak didn't use to apply for this. But nowadays they've biologically modified and twisted themselves so much that they might not even ''have'' any sort of natural reproduction cycle. Almost every Umiak seen is a clone of some sort.
* Kayoss in ''Webcomic/LsEmpire'' reproduce by holding hands. Each Kayoss can only mate with [[SingleTargetSexuality one person]], even if that person isn't a Kayoss, or in Void's case, [[{{Robosexual}} alive]].
* In ''Webcomic/{{Bardsworth}},'' fairies are a female OneGenderRace. When a community wants more members, they do a ritual with some part of nature (usually a young tree) and something like [[MassiveNumberedSiblings thirty baby fairies]] result. A species called the Arbori the same way, as do the all-male demons, though their version is implied to be nastier.
-->'''Mike:''' So...your dad is a tree?
* In the Webcomic ''Webcomic/BloodIsMine'' [[spoiler:The protagonist was hatched from an egg, even though she is half human. The details of this are not given.]]

[[folder:Web Original]]
* It's not what the exact process of reproduction is for aliens in Machinima/RedVsBlue, but in the end, somebody's going to get infected with an alien parasite and give birth. Even if they're male. And the alien in question is male too. It's like a miracle to see nature at work!
* The speculative alien species ''[[http://paperiapina.deviantart.com/gallery/31840163 Triaformica]]'' has three sexes, but only needs two, each of a different sex, to reproduce. Sexual organ-wise, they're all hermaphrodites and the organs are in their chests, accessable via a normally airtight hole into which they stick their own tongue during mating to get their own set of sex cells. Then they stick their tongue into the hole of their partner while said partner is in heat to drop the cells into. The whole process takes about a minute and, while it feels 'nice' to them, it certainly isn't as pleasurable in the same way as humans.
* [[spoiler:The Entities]] of ''Literature/{{Worm}}'' undergo a sort of mitosis, the adult producing multiple offspring once it has [[spoiler:finished experimenting with shards and consuming all available nutrition]]. The offspring then depart by [[spoiler:detonating the planet they are currently on]]. Different lineages have varying forms of reproduction due to divergent evolution.
* ''Wiki/SCPFoundation''
** [[http://scp-wiki.net/scp-149 SCP-149 ("The Blood Flies")]]. SCP-149 are mosquitos that reproduce by injecting a retrovirus into the human body that changes cells into fertilized mosquito eggs. When the eggs hatch the mosquitos leave the body through the mouth, nostrils and eye sockets. This invariably kills the victim.
** [[http://scp-wiki.net/scp-150 SCP-150 ("The Prosthetic Parasite")]]. SCP-150 burrows into a human body and changes the nearest limb (arm or leg) into SCP-150 tissue covered with a chitinous exoskeleton. The victim is mind controlled into removing the limb, which then hatches out more SCP-150 larvae.
** [[http://scp-wiki.net/scp-538 SCP-538 ("Shadow Spiders")]]. Shadow spiders reproduce by biting a victim. After about an hour the victim suffers a horrible death and their shadow breaks up into pieces. Each shadow piece becomes a new shadow spider.
** [[http://scp-wiki.wikidot.com/scp-631 SCP-631 ("Nyctophobic Nocturnal Predator")]]. SCP-631 eats the internal organs of a sleeping human victim and lays its eggs in the body. When the eggs hatch an hour later the babies eat the body.
** [[http://scp-wiki.wikidot.com/scp-632 SCP-632 ("Intrusive Thoughts About The Many Spiders Forming Inside Your Head")]]. SCP-632 are small spiders that create a filament of spider silk and attach their eggs to it. When the filament touches warm skin the eggs hatch and burrow into the victim. When the baby spiders reach the brain they grow inside of it and cause a headache. The victim's attempts to stop the headache releases the adult SCP-632.
** [[http://scp-wiki.wikidot.com/scp-695 SCP-695 ("Eels")]]. Juvenile SCP-695 perform a OrificeInvasion on a male human, grow to adult size and lay eggs. They then force the host to rape a female human and infect her with the eggs. The eggs will grow into juveniles, which will leave the female's body through either an OrificeEvacuation or performing a ChestBurster out of her abdomen.
** [[http://www.scp-wiki.net/scp-1092 SCP-1092 ("A Species of Fish")]]. SCP-1092 reproduces by having one of its eggs enter the body of a large mammal through a cut and grow to adult size (up to 2.1 centimeters) inside the mammal's blood vessels.
** [[http://www.scp-wiki.net/scp-1294 SCP-1294 ("The Laughing Fox")]]. SCP-1294 is a fungus that reproduces by [[FaceFullOfAlienWingWong mating with a female fox]]. Its offspring grows inside the fox and eventually escapes as a ChestBurster.
** [[http://www.scp-wiki.net/scp-2401 SCP-2401 ("Mary Had A Little Lamb")]]. SCP-2401 are unusual honeybees that can infest and control a human body, but males all die quickly and most of the females commit suicide. When the host body is female it can have sex with a human male and become impregnated. The babies will be adapted to be better hosts.
* One user's dream in ''Literature/NightmareBeings'' was about some kind of bird that laid clutches of orange eggs that each had a pair of insect legs, and walked around forming long trains together.
* In "Body Shifters Universe" the aliens are human sized bacteria that shapeshift into whatever form a person finds most attractive, absorbs the DNA and divides into two more shifters who continue to mate with the nonshifter parent.

[[folder:Western Animation]]
* ''{{WesternAnimation/Futurama}}''
** Amphibiosans (Kif's species) become receptive to DNA transfer when they develop a strong emotional bond with someone, their ''smizmar''. DNA is then transferred through touch, and presumably any species' DNA is compatible. While in the episode in question the biological parentage gets [[{{HilarityEnsues}} mixed up]], the ''smizmar'' is considered the "true" parent.
** Dr. Zoidberg's species lay eggs into the ocean and then die off en masse. He's only lived so long because no female seeking a mate will even look at him. This doesn't prevent Zoidberg having a JewishMother-equivalent relative, or introducing himself as "Norm and Sam and Sadie's boy." This is kind of FridgeBrilliance; since only the most disgusting and pathetic members of his race survive to raise the young, who do you think's going to be teaching them their standards?
** Futurama plays with this trope a bit by having aliens be unaware of human reproduction. Human noses are harvested as an aphrodisiac under the incorrect assumption that the "human horn" is the main reproductive organ. Lrrr is surprised to discover that humans have a "lower horn" hidden in their pants.
* There was an episode of the 90s ''WesternAnimation/XMen'' cartoon where Rogue was almost turned into a Queen for the Brood, an alien race which breed by basically infecting other species and turning them into one of themselves. However, Rogue touched {{Wolverine}}, borrowing his HealingFactor and returned to normal.
* The [[WidgetSeries French/Czech cartoon]] ''Animation/FantasticPlanet'' features the Draags. When the Draags wish to reproduce, they go into a meditative trance, which causes a spherical forcefield bubble to form around a small representation of themselves which then float up into the sky toward their planet's moon. Upon reaching the moon, they land on gigantic, headless Greco-Roman statues, which proceed to dance the waltz (no, really, that's all they do). In all fairness, that could have just been foreplay -- the Oms (humans) did sort of start destroying the statues mid-dance. Also, despite the Draags exhibiting sexual dimorphism (there are Draags with breasts and ones without), all Draags form pink bubbles and land on the female statues. The male statues have blue bubbles which are stated as coming from some other species "from other galaxies". It's implied in one of the history lessons that there have been Draags for longer than there has been meditation, so the entire thing may really just be literally foreplay with aliens before they actually reproduce amongst themselves.
* The MechanicalLifeforms of Franchise/{{Transformers}} often have some "Bizarre Alien Assembly Process". Since ''WesternAnimation/BeastWars'' they're usually depicted as metamorphosing from blank-faced liquid metal "protoforms," which depending on continuity may be grown in energy "wombs" and become fully grown cybertronians once they get sparks implanted. At least one series mentioned "protoform molds", which might be a jab at the old die-cast toys.
* ''WesternAnimation/StevenUniverse'':
** Gems are manufactured from non-living minerals using special machinery, with the new gems literally popping out of a hole in the ground. The Classroom Gems short "How Are Gems Made?" elaborates on this procedure: the Gems [[BornAsAnAdult pop out fully grown]], [[spoiler:but the procedure also drains life from the soil and nearby plants and leaves the ground barren and withered]]. [[HumansThroughAlienEyes Viewed from the opposite direction]], Rose found ''humans'' had bizarre reproduction methods, finding the idea of growing up so weird that she thought adult and child humans were different species.
** While the conception of the eponymous HalfHumanHybrid probably had some conventionally human elements, there were some odder steps to get around his gem mother being from an artificial species that was never designed to sexually reproduce. She had to use shapeshifting to ''grow'' a womb, because she naturally has NoBiologicalSex, and find some way to pass on genetic information when she apparently had no DNA. Most importantly, since her HeartDrive is her real body, she had to pass it on to Steven, [[DeathByChildbirth giving up the original form of her mind and body]] to ''become'' part of him.
** The [[PlantMooks Watermelon Stevens]] [[PlayingWithATrope reproduce exactly as one would expect... for watermelons]]. The young are grown in watermelon patches just outside the village, and are delivered to the adopting parents' door.
* In ''WesternAnimation/SpongeBobSquarePants'', [=SpongeBob=] reproduces by budding--that is, smaller copies of himself sprout from his sides and eventually detach. TruthInTelevision, as this is one method in which real sea sponges reproduce.

[[folder: RealLife]]
* Many of the above scenarios were based on the life cycles of RealLife organisms.
* [[http://en.wikipedia.org/wiki/Ichneumonoidea Ichneumon wasps]] implant eggs in host species, typically caterpillars. Hosts are also infected with a polydnavirus that suppresses their immune systems to protect the eggs. The larvae consume the least essential portions of the host's anatomy first, keeping it alive as long as possible. Once the larvae are mature, they emerge from the still living host and weave cocoons. Certain species produce mind-altering chemicals that causes the host caterpillar to guard and protect the cocoons until they hatch.
* [[http://en.wikipedia.org/wiki/Eusociality Eusocial insects]] have a reproductive caste.
** In honeybees, sex is usually determined by males being haploid (one set of chromosomes) and females being diploid (two sets of chromosomes, like humans). Female larvae fed royal jelly become the reproductive "queen" caste.
** In termites, all castes are split between male and female but, depending on the needs of the hive, can change caste. If any of the queens or kings in a colony dies, another will change to take their place.
* As mentioned above, some insect species have haploid males and diploid females. For them, a mature female can reproduce without mating. The resulting offspring are always male.
* Prokaryotes physically merge when mating, in a process called [[http://en.wikipedia.org/wiki/Bacterial_conjugation bacterial conjugation.]] Mating also has little, if anything, to do with reproduction; they reproduce asexually. As a result, traits and genes can jump species and ever across ''kingdoms''. This is why the non-eukaryotic parts of the evolutionary tree are more like a tangle of roots.
* Plants [[http://en.wikipedia.org/wiki/Alternation_of_generations alternate generations.]] In the case of flowering plants, the equivalent would be a human becoming pregnant, then having sex which fertilizes their fetus, and then the fetus gives birth to the offspring.
** A similar process can be seen in aphids, which alternate generations between parthenogenic females and sexual reproduction.
* [[https://en.wikipedia.org/wiki/Jellyfish#Life_history_and_behavior Jellyfish]] basically have sexual reproduction producing larvae, which then settle down as a polyp, which in turn buds and produces new medusae asexually, and the cycle begins anew.
* Internal parasites, such as [[http://en.wikipedia.org/wiki/Dicrocoelium_dendriticum#Life_cycle liver flukes,]] make ''all'' the above examples seem routine.
* The male anglerfish is tiny compared to the female. The sole purpose of the male in life is that once he gets the scent of a female, he swims to her and bites down on the side of the female. At the same time he excretes an enzyme at the mouth which causes it to physically fuse to the side of the female, and is functionally reduced to a pair of balls hanging from the side which the female can use to impregnate herself when it is most convenient. When anglerfish were first studied, the males were thought to be a completely different parasitic species.
* Subverted with most polygamous birds; the actual process of reproduction for them is strange from a mammalian standpoint, but also pretty vanilla, being just them touching their genitals together (a process appropriately and adorably referred to as a "cloaca kiss"). However, the ways the male attracts the female to mate with him can be ''very'' weird. Temminck's tragopan, for example, has a bright blue wattle that he expands and starts flailing about whilst making clicking noises. The frigatebird has an inflatable red throat pouch that he blows up like a balloon before warbling loudly to females that fly over him. The buff-breasted sandpiper displays his ''armpit'' (wingpit?) to the females. And perhaps the strangest example, the ruff bird often attracts females by essentially having ''gay threesomes''. Yep, an entire species of birds wherein the females think GuyOnGuyIsHot.
* Because mating in water can be awkward if you have no grasping appendages and your spine isn't flexible enough to entwine around your partner, dolphins resort to ExoticEquipment to maintain a grip on their mates. Female dolphins' vaginal walls constrict to hold on, and males have a ''prehensile penis'' to cling to convolutions inside the birth canal. Both sexes occasionally use their genitals to grasp objects other than mates, ''Series/BabylonFive''-Centauri style: if you visit a Swim-With-Dolphins attraction, you can count on all the animals being females, because males have a bad habit of grabbing tourists' wrists or ankles with their you-know-whats.
* Many polychaete worms follow a mating strategy called epitoky, where entire segments of the worm transform into reproductive organs, which then detach from the worm and seek out other such segment to mate. Sylldiae worms, however, take this [[UpToEleven a step further:]] their reproductive segments are [[ExoticEquipment fully mobile,]] and when they meet their counterparts, they friggin ''[[ActionBomb explode]]'' in a blast of egg/sperm cells.
* Most microorganisms have no gender and reproduce by [[HalfTheManHeUsedToBe splitting in two]]. The cells that make up any multicellular do the same for the organism to grow.