[[quoteright:292:[[WebComic/MenageA3 http://static.tvtropes.org/pmwiki/pub/images/Boneularity_4170.jpg]]]]
[[caption-width-right:292:[[Main/FridgeHorror And then]] you realize this [[Main/BrainBleach also means]] ''[[Main/IncestIsRelative every family member]]''.]]

In some branches of sci-fi, a major aspect of the {{Utopia}} -- or, in some cases, a {{Dystopia}} -- is the decline of monogamy.

Or, to put it bluntly, [[EveryoneHasLotsOfSex everyone sleeps with everyone]] and has a right to do so.

There is [[EthicalSlut no longer any social stigma attached to promiscuity]]. In fact, the few who ''are'' strictly monogamous are likely to be the ones who get weird looks. No-strings-attached sex may be seen as a great way of getting to know people, a good method of recreation or, alternatively, it may be suggested that it's a biological imperative to have children by as many people as possible (a popular concept when the resident population is limited - such as colonies or AfterTheEnd events). The attitude to sex may vary from a cheerfully accepted part of life ("Hey, I'm bored. Wanna test the bedsprings?") to a pragmatic one ("Damn, the kid I had with George turned out to be AxCrazy. Better have the next one with John."). No-one really cares who you sleep with either - any and all partners are acceptable.

Occasionally, FridgeLogic will creep in. Contraception and sexual protection is rarely mentioned, and as any [[PublicServiceAnnouncement government information advert]] is quick to tell you, if you're sleeping with more than one person you better demand a full medical certificate from every partner or take the appropriate precautions. This might be explained by the author if they claim that this has been specifically enabled by science wiping out [=STDs=] and developing foolproof, convenient stealth contraception that everyone in the population uses.

Less easy to [[HandWaving handwave]], though, is the one issue technology isn't likely to fix: jealousy. In the present day, many people would take a very dim view of their partner sleeping with ''one'' [[YourCheatingHeart other person]], never mind having sex with ''anyone'' who took their fancy. Idealistic views of love often include ideas of one, single soul mate. Conversely, in its more negative incarnations, love is commonly [[LoveMakesYouCrazy associated with jealousy]] (or even, [[LoveMakesYouEvil possession]]). While a few stories will make a real attempt at explaining the decline of jealousy (since we already [[YoureJustJealous acknowledge]] it as one of the more [[GreenEyedMonster negative emotions]]), a more common tactic is to demonise or mock anyone who expects a partner to be exclusive to them. They will probably be regarded as backward, repressed or selfish in a Free Love Future. They don't have to go AxeCrazy or [[Film/FatalAttraction bunny-boiler]] to be labelled a jealous nutcase - even asking a partner to be faithful will probably be seen as a laughable expectation at best, and a selfish demand that infringes on the other person's rights at worst. It could, however be explained as [[ValuesDissonance everyone being raised that way,]] and therefore most everyone not caring because it's been ingrained in them since birth. There are also the cases where sex is entirely separated from romance, allowing the characters to have a single ''soul''mate, but considering that sleeping with someone else is perfectly normal because there's just no correlation between the two, from their point of view.

Commonly, a Free-Love Society will socially legitimize extra-marital affairs, where you may be married to one person, but it's socially acceptable to [[UnusualEuphemism explore]] other people.

Openly sexual societies are also frequently predicted to be the result of disassociation between sex and reproduction, for example, in a civilization that embraces [[DesignerBabies Ectogenesis]] ([[http://en.wikipedia.org/wiki/Ectogenesis * ]]) or selective breeding (in which cases contraception may be not only popular but ''mandatory'') and sexually-transmitted diseases would be given the same regard as influenzas. Families as a standard child-rearing unit may or may not exist, and most likely would deviate from the "traditional" nuclear family; at the very least, coupled biological parents of children won't be expected to live together or with their children. Expect NoBloodTies to be commonplace, if not the norm. In this case, you might see a lot of ParentsAsPeople.

[[{{Dystopia}} Dystopian]] free-love societies will emphasize [[WhatIsThisThingYouCallLove depersonalization of sex]]. In works depicting less extreme societies, expect a lot of [[{{Polyamory}} polyamorous relationships]], that is, full-spectrum friend and lover relationships in which intimacy is part of the mutual trust, but exclusivity is outside the defined commitment.

Often involves an EveryoneIsBi society. A DoubleStandard may be in operation, often ensuring that one gender is sexually available for their entire lives while the other can only do so until they get married, whereupon they are expected to be faithful to their partner. Often interpreted as wish fulfillment or AuthorAppeal, especially if they remember TheSixties.

See also EternalSexualFreedom for when this is applied to real ''past'' societies, and FetishFuelFuture for the more general trope of "in the future, everyone will share/accept my personal sexual kinks" AuthorAppeal. This trope is also the logical future extension of the EverybodyHasLotsOfSex setting. May involve or allow ExoticExtendedMarriage. Contrast with NoSexAllowed.

Became popular as part of NewWaveScienceFiction in the [[TheSixties 1960s]].



[[folder:Anime and Manga]]

* PlayedForLaughs [[FelonyMisdemeanor and mock horror]] in ''Manga/MyMonsterSecret''. Rin (Asahi's [[KidFromTheFuture future grand-daughter]]) comes from a BadFuture where sluts and perverts rule the world, due to the actions of the Charismatic Pervert II. The resistance is comprised of [[AllWomenAreDomsAllMenAreSubs the ten percent of men who are not masochists, and the thirty percent of women who are not sadists]].


* ''ComicBook/ElfQuest'' is a variation. The elves are descended from an advanced species who are implied to have outgrown the need for physical pleasure. Acquiring elf form restored their ability to feel sexual pleasure, and they've been exploring every possible (ConsentingAdults) variety ever since. It helps that the elves' birthrate is low.
* In ''ComicBook/TheAuthority'', Midnighter encounters people from a future where "everyone does everyone", and no-one remembers what heterosexuality, homosexuality or bisexuality even ''means''. It's more implied to be an EveryoneIsBi future, though, as the head time agent points to her two (male) partners and says, "They got together after they found out their girlfriends were seeing each other."
* In the hedonistic future of ''ComicBook/{{Transmetropolitan}}'', sex is as trivialized as everything else; the most popular children's cartoon is the Sex Puppets, and Channon orders oral sex along with her meal at a restaurant. All kinds of perverse fetishes are implied, but pedophilia remains illegal and reviled, at least by Spider.
** Of the two pedophile characters we meet, one is driven to suicide by the public revelation of his behavior, while the other is a religious leader who used his influence to escape charges of child rape (but not Spider's ExtremeMeleeRevenge) and who also leads a NAMBLA-like organization...which seems to get as much respect as the real NAMBLA. So it appears Spider is not alone. [[ConsentingAdults Nothing is really safe or sane in the City, least of all sex, but consent still seems to be an absolute requirement]].

* The original script for ''Film/{{Alien}}'' had a scene where Ripley casually says to Captain Dallas that she needs "release" and starts taking off her clothes. Of course this could be simply be the norm among long-haul spaceship crews, or it implies a previous sexual relationship between the two.
** It was supposed to go even further. WordOfGod from Creator/RidleyScott is that casual sex is rampant in ships such as the Nostromo, seeing as how they could be in space for months at a time and there's not a whole lot else to do. A deleted scene had Ripley nonchalantly ask Lambert if she had ever slept with Ash, to which she shrugs and says that he never appeared interested (one of the first hints that Ash [[spoiler: is a robot]]).
* DoubleSubverted in ''Film/DemolitionMan''. Huxley proposes sex with Spartan so casually that it completely takes him aback. However, it snaps back when he learns that their version of sex is in some ways more conservative than the modern version (no physical contact), but also apparently uncomfortable for him. It's unclear whether this is because of something inherent in the technology or because he was expecting something closer to boning, the wild mambo, the [[UnusualEuphemism hunka-chunka]]. She on the other hand considers "exchange of bodily fluids" disgusting, since the rise of [=STDs=] such as [=AIDS=] have greatly stigmatized it in her society.
* In the future world of ''Film/LogansRun'', sex is viewed as a casual activity to pass the time. Almost to the point of, "I'm bored... wanna shag?"
** The plot addressed this twice; once when Logan and Frances are watching the infants be implanted with Lifelocks, and later when Logan and Jessica meet the old man and are amazed that he not only knew who his parents were but was raised by them. It's not specifically stated, but the implication seems to be that all babies are conceived in vitro. When Logan 5 points out Logan 6 to Frances, he openly states he has no idea who the mother is, and seems to imply that he's the father.
*** There is also one scene in [[Literature/LogansRun the book]] where a female runner gets caught because she detours to a nursery she happens to see thinking "my baby might be in there!" implying that babies are taken away from their mothers immediately or shortly after birth.
** Also of significance is ''The Circuit'', an electronic carousel for sex-seeking singles looking to hook up with an anonymous partner. In the book, the glasshouses fill a similar role. The places get their name from the rooms; they're made of transparent glass, intermittently lit with colored lights so that the patrons can watch and be watched by others who are getting it on with virtual strangers.
* Probably the case in ''Film/StarshipTroopers'', given how everyone regarded the unisex, communal showers as no big deal. In the shower scene it was mentioned that you need a [[PopulationControl license to reproduce]], so perhaps contraception is mandatory.
* In ''Film/SixTheMarkUnleashed'', the Community's holographic program instructs new initiates of the [[MarkOfTheBeast Holy Implant]] that with the New Order brought about by [[TheAntichrist the Leader]], things such as monogamy have been done away with so that [[ReallyGetsAround people are free to move about]] [[EveryoneIsBi with partners of either sex]]. Procreation is only allowed according to the will of the Leader. The real downside to this "blessing", however, is that [[BlessedWithSuck those with the Holy Implant are destined for the Lake of Fire]].
* The [[HumanAliens Transylvanians]] in ''Film/TheRockyHorrorPictureShow'' seem to be this.

* [[Creator/IainBanks Iain M. Banks]]'s [[Literature/TheCulture Culture]] novels are suggested to be extremely open, same sex, multisex and sexchanging are all common. Near the start of ''Player of Games'', it's suggested Gurgeh is kinda weird for only seeing woman and trying monogamy. Confirmed in ''Excession'' where it is stated that monogamy is extremely rare, it is far more normal for a couple to stay together throughout their offspring's childhood and adolescence but even this isn't a given.
* In Creator/AnneMcCaffrey ''Literature/DragonridersOfPern'' series, dragonriders consider it detrimental to their dragons to be strictly monogamous and will sleep with whichever rider is bonded to the dragon that mates with their own. It makes sex literally a way of promotion among dragonriders. You want to be a Weyrleader? Get a senior queen's rider into your bed and make sure she stays there long enough. Even if dragon mating isn't involved, the dragonriders have a habit of taking multiple lovers and most (heterosexual/bisexual) riders will have many children by several different partners. In a bit of a RuleAbidingRebel moment though, the "best" of the characters - such as F'lar and Lessa - are all in exclusive partnerships. A DoubleStandard is involved here - most ''women'' are mongamous, and those that aren't were either [[GoodPeopleHaveGoodSex unpleasant]] (Kylara), [[RapeAsDrama raped]] (Tai) or romantically unfulfilled (Moreta). In-universe, non-dragonriding women can sleep with who they like until they marry, while men (particularly Lord Holders) retain this privilege even after marriage.
* [=McCaffrey=] has also written several short stories on the theme, including "Changeling", which dealt with a woman who bore the children of three different men (including one who was exclusively gay...)
* Most of the later works of Creator/RobertAHeinlein feature a cheerfully polyamorous future, especially if Lazarus Long is involved. Heinlein was also fond of legitimizing [[http://en.wikipedia.org/wiki/Polyfidelity expanded families]] (i.e. non-polygyny-centric polygamy) in which sex was consensual within the group.
* Creator/TanithLee's ''Literature/BitingTheSun'' depicts a future like this. Jang (young adults) are considered deviant if they're ''not'' sleeping around.
* ''Literature/BraveNewWorld'' by Aldous Huxley takes the Ectogenic route, and visualizes a [[CrapsaccharineWorld not-so]] idealistic society in which participation in public orgies is ''mandatory'', as is contraception or sterilization.
** Citizens are expected to demonstrate no less than full involvement in the community, including participation in [[ExactlyWhatItSaysOnTheTin orgy porgy]]. Even the slightest deviation (say, that for a sexually exclusive relationship, a modicum of privacy, or an extraordinary predilection for solitude) results in extreme pressure to conform.
* In George Alec Effinger's ''Literature/MaridAudran'' trilogy, transsexual surgery is so common that sexual mores are thoroughly blurred. Anyone who insists on "pure" gender roles is likely to be considered kinky.
* Likewise in Creator/JohnVarley's ''Literature/EightWorlds'' stories, though a surprising number still do adhere to some forms of traditional sexual mores as they struggle to reconcile 300 years of technology with [[strike:thousands]] millions of years of evolution.
* ''TheAmtrakWars'' by Patrick Tilley. Sex is no big deal, and "love" is unheard of; the word doesn't even exist in their society.
* In the ''Literature/{{Ringworld}}'' novels, where the species that have evolved on the Ringworld are mutually infertile, sex is used as a way of opening negotiations between them.
** Louis Wu, an Earthling, doesn't see any problems with this, especially since he himself hasn't really been in a long-term relationship and just sleeps around. However, even he is a little taken aback when a women from one of the Ringworld races suddenly demands why has yet to offer ''rishathra'' (interspecies sex) to seal their verbal agreement. The sad irony is that Louis keeps his side of the bargan (to save the Ringworld no matter what) even when the only way to do that is to [[spoiler:irradiate the chunk of the structure her race lives on]].
* In the One State, the setting of Yevgeny Zamyatin's novel ''Literature/{{We}}''--which inspired both ''Brave New World'' and ''1984''-- it's the law that "every number has a right to every other number, as to a sexual commodity." "Number," in the usage of the One State, replaces both "person" and "citizen," by the way.
* In the second part (of three) of Creator/ArthurCClarke[='=]s ''Literature/ChildhoodsEnd'' the perfection of contraception, STI treatment and paternity-tracking technology are all that are necessary to cause civilization to become a global ''Free Love Society'' inside a single generation. Clarke notes that the [[BenevolentAlienInvasion Overlords]] didn't have anything directly to do with these developments.
** The [[TakeThat dissolution of most major Earth religions]] (thanks to the Overlords) was going on at the same time -- this may have been a factor in the death of monogamy.
* In ''Imperial Earth'' by Arthur C. Clarke the protagonist has a homosexual love affair with his best friend when they are teenagers, which becomes a three-in-a-bed triangle when they both fall in love with a female visitor.
* ''Literature/VorkosiganSaga'':
** Beta Colony is described has having very relaxed mores. The age of consent is approximately puberty, and for girls there is a small rite of passage with the first contraceptive implant, and the Orb of Unearthly Delights is a bordello famous throughout the galaxy. There are no prostitutes as such, but there are plenty of licensed ''sexual therapists''. Betans wear coded ear rings to advertise their partnership status and avoid complicated guessing games. Also, hermaphrodites are somewhat common. It's worth noting that unlike other examples, fidelity and monogamy are consider perfectly valid choices. And while sex mores are rather loose, ''reproduction'' is ''very'' strictly controlled.
** Cetaganda, with their insistence on DesignerBabies and pre-negotiated genetic matches between parents who may have never even ''met'' combines Free Love Future with DarwinistDesire, particularly for the haut class nobility.
* In Michael Moorcock's ''Dancers at the End of Time'' novels humanity has shed all its taboos as a result of acquiring immortality and godlike powers.
* In Creator/PiersAnthony's ''Literature/ApprenticeAdept'' series, this is one of the things that sets apart the conservative, magical world of Phaze and the decadent science-based Proton. In ''Phaze Doubt'', an android has to be badgered into not pressing her attempts at sex with the protagonist on a public transport; not because it's taboo, but because she was clearly annoying him.
* ''Literature/HonorHarrington'':
** Residents of the planet Beowulf have a very relaxed attitude towards sex and personal relationships. The title character's mother is from there and has a habit of outrageously sexual comments in public, and once wore a...''trampy'' cocktail dress at a party on a highly conservative planet, in part for {{Troll}}ing purposes. By Beowulf standards, she's fairly conservative.
** Manticore takes the trope in another direction: so long as it's between consenting adults, whatever relationship or lack thereof one wants and can find partners for is acceptable, and nobody raises an eyebrow about strict monogamy, asexuality, homosexuality, {{Polyamory}} or a girl in every port. ([[YourCheatingHeart Cheating on a committed relationship]] is ''not'' okay, but that's because you're [[IGaveMyWord breaking your word]].) The author makes an {{Anvilicious}} contrast between this and Beowulf's version; Manticore's is portrayed as the [[{{Utopia}} Utopian]] version, while Beowulf pushes a bit further down the [[{{Dystopia}} Dystopian]] road than would be ideal.
** It's also stated that Earth isn't that much different from Beowulf in that respect. However, since humans have a tendency to adopt the PlanetOfHats mindset, Beowulf is the one that's seen as the "free love" planet, Earth being the cradle of humanity and the heart of the Solarian League.
* In ''Literature/TheDresdenFiles'', Harry realizes that this is the ultimate goal of the [[OurVampiresAreDifferent White Court]]. This is '''''NOT''''' a good or altruistic thing. They want this for two reasons. For food, and to eliminate Love, the one thing they're allergic to.
** The Raith family in particular wants this. Other families in the White Court feed on other emotions, like fear, and are allergic to their opposites; they wouldn't necessarily take a direct benefit from the elimination of love, although they might just be cartoon-villain enough to want it gone anyway. Or it might benefit indirectly - the house of Skavis, for example, feeds on despair and is injured by hope in the same way the Raiths are by love, and real love can help give one hope.
* Creator/FredSaberhagen's ''Love Conquers All'' is set in one of these, where casual sex is so common that people looking for a meaningful relationship, or even a platonic one, are considered perverts, and having children is looked upon as an unfortunate necessary evil; prostitutes no longer sell their bodies, but are paid to talk philosophy with their clients. Overhanging all this free love, as the protagonists learn, is the threat of a massive, catastrophic decline in population once the current generation starts dying off.
* Many of Vonda N. [=McIntyre=]'s works, including ''Literature/{{Dreamsnake}}'' and the ''Starfarers'' series.
** This seems to coexist with stable, exclusive relationships, in Dreamsnake when a someone falls in love without quite realising it, this is manifested in their not wanting to sleep with anyone else and when they turn down an offer of sex, being in love is accepted as a very reasonable excuse.
** Quite a nice gender inversion as it is the man who goes all monogamous.
* Creator/BrianAldiss's ''The Primal Urge'' is a satire in which a machine that makes it impossible to hide sexual attraction has a dramatic affect on British reserve.
* Creator/RobertSilverberg's ''The World Inside'' is set in a huge skyscraper (Urban Monad or [[WeWillUseWikiWordsInTheFuture Urbmon]]), in which men are expected to go "night walking", wandering into other peoples' homes for sex, and it's unthinkably rude for a woman to refuse an advance. Silverberg goes into a bit of detail as to how such a society would produce unique sexual hangups of its own. One character is trying to make her husband jealous, which he points out is ridiculous. Meanwhile, she mocks him for sleeping with a woman because he's attracted to her brother--instead of sleeping with the brother.
* In Creator/SergeyLukyanenko's ''[[Literature/ALordFromPlanetEarth Sea of Glass]]'', the protagonist is a modern-day man who ends up in the 22nd century at the end of the previous novel. At one point, he encounters a group of people known as rodders (a mix of bikers and hippies), who choose to live on the road (no bikes, though). He then sees three of them (two males and a female) having wild sex in the middle of the woods. He returns to an old rodder and asks if this is how things are done now, especially since one of the males is 13 (age in the 22nd century is no longer a sign of maturity; once a person can prove his or her independence, he or she is considered an adult). The man replies that this is a price to pay for the complete freedom their society enjoys. Freedom and arbitrary rules don't mix. It is not clear if this behavior is only limited to rodders or is prevelent in the general population. The protagonist himself is happily married to his HumanAlien [[EverythingsBetterWithPrincesses princess]] wife, but both of them are from the late 20th century.
* ''The Rainbow Cadenza'' by J. Neil Schulman takes the slogan "Make love, not war" to its dystopian conclusion. In a society where men vastly outnumber women, the latter are conscripted into brothels (with accompanying propaganda and social/legal pressure) under the rationale that male aggression needs to be diverted into sex rather than fighting. Those women who refuse can legally be hunted down, raped and killed.
* ''Literature/TheForeverWar'' by Joe Haldeman. By law no-one can be conscripted into the military unless they are already promiscuous, and in basic training all recruits have a 'sleeping roster' where they're assigned a different partner every night (which leads to grumbling that you always get the dead-tired ones when you're horny, and vice versa). By the end of their first tour though, everyone has settled into a regular (though still not strictly monogamous) relationship with someone. Due to TimeDilation however human society has changed vastly since they left; promiscuous heterosexual relationships are discouraged due to over-population. With homosexuality the norm, such behaviour is regarded (at best) as a quaint anachronism and at worst outright perversion.
* A rather startling example for [[WhatDoYouMeanItsForKids young adult novel]] is in the Literature/GreenSkyTrilogy. Kindar "youth" (from age 13-25) are ''expected'' to live communally, and have "close communion" (sex) with others as they wish. This is facilitated by an herbal method of birth control, consumed in a weekly ritual. After they leave the halls and "pair-bond" (marry), they're supposed to remain more or less monogamous. The Erdlings, without access to the contraceptive plant and with limited supplies of food, have a much stricter set of sexual mores. The Ol-zhaan elite are forbidden marriages and family, but are free to have "close communion" with other Ol-Zhaan.
* There are elements of this in Susan Price's ''Odin's Voice'' trilogy: early on in the first book the teenage [[SpoiledBrat protagonist]] avoids an argument by asking a male friend if he wants 'to sex'. They sign a consent form and go off to a dedicated room. Of course, this is a society where classical gods such as Hera are still worshipped, so you might assume there are still conservative attitudes around as well.
* In Creator/IsaacAsimov's ''Literature/TheRobotsOfDawn'' the hedonistic robot based culture of Aurora has 'free love' completely divorced from reproduction, making sex meaningless and far less satisfactory. At least, that's how an outsider from a NoSexAllowed society sees it; the locals keep insisting it's not that bad. Jealousy is considered an obscene word. One [[FreudianExcuse villain]] claims her life was ruined and her mind warped because her father raised her personally (thus socially isolating her), then refused to have sex with her when she asked.
* In ''Literature/TheDispossessed'', it is mentioned that people who aren't coupled frequently engage in one-night stands. Also, it is not uncommon for friends to have sex with each other to affirm their bond. The main character Shevek has sex with his male friend, even though Shevek is not particularly attracted to him
* In ''Literature/{{Replay}}'', Jeff Winston muses about the "future" of sexuality of the 1980's when he's stuck in 1963.
* In Creator/DavidBrin's ''Literature/{{Uplift}}'' series many humans have little trouble sharing their spouses. Possibly influenced by our chimpanzee and dolphin clients who are by no means monogamists.
* Creator/GeneWolfe's ''Home Fires'' is set in a future where marriage is a largely unknown anachronism restricted to religious people. Instead, people form "contracts" (basically civil unions - and they can be same or opposite sex), and monogamy is not expected. Except that people still get jealous and react badly to their partners having relations with others - however they also don't understand why they feel jealous and even try to rationalize away their feelings.
* ''Literature/TheFallOfTheSeaPeople'' is not a free-love future but a free-love past. Mostly it ticks the poly and bi boxes, although it is a dystopian example and more unusually the protagonist is forbidden from participating.
* In Donald Kingsbury's ''Literature/CourtshipRite'', the people of the LostColony of Geta have at least a mild version, possibly justified in part by the need to keep birth rates high to match the high death rates, as well as the need to avoid excessive inbreeding. Most Getan clans may be trying to breed themselves for specific traits, but they're very aware of the dangers of inbreeding. In any case, casual sex seems common, even for married people, although jealousy is far from unknown.
* In an inverted example of a Free Love Past, both the Neanderthals and the Cro-Magnons in the ''Literature/EarthsChildren'' novels are fairly blase about who's getting it on with whom, mostly because neither society is clear on the concept that sex leads to pregnancy.
* The Takisians from the ''Literature/WildCards'' series have this. While their Psi Lord nobility practice ArrangedMarriage as part of a SuperBreedingProgram, nobody expects either the men or the women to remain monogamous, only to restrict actual procreation to partners specified by the breeding plan. Both genders keep concubines. Takisian commoners likewise have very open sexuality. The entire civilization has no concept of homophobia and procreation and love are regarded as two different things. Interestingly, Takisians have a ''very'' strong [[RapeIsASpecialKindOfEvil cultural taboo against rape]] and even Psi Lords, who have MindControl powers, consider rape to be a sign of total depravity on the part of the rapist.
* Turns up a lot in the novels of Creator/OlafStapledon, where the future features lots of polyamory, group marriage, and a general loss of sexual taboos. Stapledon (who wrote in the 1930's) was possibly one of the earlier authors to portray such a future in a positive light.
* In the ''Literature/StarCarrier'' series, people who live in arcologies (and many others, especially in the SpaceNavy), don't form permanent attachments or enforce them legally (i.e. marriage). Instead, they live in close sexual groups and look down on those who do form such attachments and permanently pair up, often using the derogatory slur "monogie" (from "monogamy"). Often enough, "monogies" are those who squat in the ruins of old coastal cities, flooded when the oceans rose. It's stated several times that the "prims" (from "primitive") who live in the Periphery become "monogies" because 2 is the optimal number for survival in the ScavengerWorld (i.e. someone to watch your back, but not too many mouths to feed).
* Some of the settled worlds in ''Literature/CaptainFrenchOrTheQuestForParadise'' have this, to an extent. The denizens of [[Literature/JohnCarterOfMars Barsoom]] don't view sex as taboo and have to problems sleeping around. Averted on more conservative worlds (or worlds currently undergoing a burst of conservatism), such as Poitex, where CulturePolice watches over all.
* The future scenes in Redfern Jon Barrett's ''Literature/TheGiddyDeathOfTheGaysAndTheStrangeDemiseOfStraights'' show a society in which polyamory is increasingly accepted, the younger generation are unconsciously pansexual, and three-way marriages are becoming legal reality.
* The SpaceOpera ''Literature/LucifersStar'' by Creator/CTPhipps has it as a minor plot point. Individual planets and cultures like the Archduchy of Crius may be conservative (though nobles of both sexes are expected to keep concubines as examples of status) but even the ANaziByAnyOtherName culture has no problems with homosexuality. DefectorFromDecadence protagonist Cassius is a bit off put by "spacer" culture sexual mores. Humans who live on ships or space stations invariably have multiple partners and care nothing about casual hook-ups while being in committed relationships. Notably, Cassius ends up romantically involved with two women on his ship who are involved with each other--which he finds off-putting than titillating. It's also noteworthy there's a thriving trade in SexSlave RidiculouslyHumanRobot units called "Bioroids" which is depicted as repugnant but widely practiced (since they're completely sentient--just BrainwashedAndCrazy).
* In ''Literature/RangersAtRoadsend'' Chip Coppelli happily exploits the fact that many women consider uniforms sexy, no taboo against extramarital sex or lesbianism is mentioned.
* In the ''[[Literature/AncillaryJustice Imperial Radch]]'' trilogy, the Radchaai empire has no universal institution of marriage, no taboo against casual or non-exclusive sexual relationships, and no societal concept of gender. While sex and/or romance can be elements of a "clientage" between a higher- and a lower-ranked person, there's some stigma against people who appear to be SleepingTheirWayToTheTop.
* In ''Literature/TheMachineriesOfEmpire'', the Hexarchate, for all its flaws, is rather chill with all sexualities and gender identities, and has nothing against polygamy - one character is mentioned as having multiple children with four partners.
* The Creator/MarquisDeSade dreamed of this future and extensively [[AuthorTract advocated it through his written works]]. A direct witness to UsefulNotes/TheFrenchRevolution, he, along with many of his characters, identified as a libertine, one who believes nothing, not even God, should stop one's pursuit of physical pleasure of all types - especially sexual, which was the primary focus of his works. Some were written strictly to offend (''Literature/The120DaysOfSodom''), others to actively promote his viewpoints as said earlier and [[WishFulfillment do all the things he wanted to do]] (''Philosophy in the Bedroom''), but virtually all his written works, including what survives that he didn't publish, are marked by extreme erotica not just between consenting adults [[BiTheWay of all genders and orientations]] but also [[PaedoHunt between adults and children]], [[GratuitousRape between]] ''[[GratuitousRape non-]]''[[GratuitousRape consenting adults,]] and even [[IncestIsRelative family members]]. He believed such a future was the best path for humanity going forward, and that it should have been an inevitable consequence of the Revolution.
** Arguably, Sade [[ExaggeratedTrope exaggerated]] this trope because he believed that literally nothing, not even mass murder, should be criminalized, as long as such things are committed for the sake of pleasure. Of course, that includes things that don't provide sexual thrills, but he loved integrating torture into his love life, and believed it should be allowed to escalate to murder if that pleased whoever was committing it. His novels are rife with examples of victims being tortured, sometimes to death, by people who derive sexual satisfaction from the act. There's a reason he is the [[TropeNamer namesake]] of sadism, though nowadays most would prefer SafeSaneAndConsensual instead of the depravity he advocated.

[[folder:Live-Action TV]]
* WordOfGod says this is how things are in the universe of ''Franchise/StarTrek'', [[InformedAttribute whether or not it was actually seen]] onscreen. Relatedly, there is no sign that Starfleet has any rules against [[InappropriatelyCloseComrades sexual relations between crewmates or people in the same chain of command]].
** Aside from the Federation, this was the [[PlanetOfHats Hat]] of Edo in ''The Next Generation'' and the Betazoids in the novels (who may not have worn clothing at all until their First Contact, and still perform weddings in the buff), to say nothing of Risa, which has varied from "classy resort planet" to "[[UsefulNotes/LasVegas Space Vegas]]".
** Interestingly, the onscreen depictions mainly skew towards the idea of inter-species sexual relations being widely-accepted (at least in the Federation) so long as they involve the opposite-sex, but same-sex relations even within a species seem to be very, very rare. In the instances where such do appear, they are either connected to demonstrations of [[DepravedBisexual villainy]] or else [[GenderBender aliens with different biology than humans]].
* In the ''Series/RedDwarf'' episode "Holoship," the ship of advanced holograms regards sex as excellent physical exercise. They even have an entire deck devoted to it. The other holograms are very puzzled at the notion that you might "[[WhatIsThisThingYouCallLove fall in love]]" and sideline your own agenda for the benefit of someone else; predictably, [[spoiler:this is exactly what happens to Rimmer's entrance exam opponent]].
** There's a reason for that. The crew of the Holoship are notoriously arrogant and all speak very coldly and professionally, even while having sex. Rimmer's passion for joining the crew ended up making him the most attractive man on that ship.
* In ''Series/DoctorWho'' and its spin-off ''Series/{{Torchwood}}'', future humanity is revealed to have taken it upon themselves to "[[BoldlyComing dance]]" with as many new life-forms as possible. The trope's poster boy is Captain Jack Harkness of the 51st century, who gets into serious trouble a few times in the 20th century just for being himself. Professor River Song also revels in the trope, having studied at a 52nd century university.
** He only appeared in ''Torchwood'' briefly, but let's not forget John Hart. Jack's ex-partner "in every way", 51th century too, and behaving consequently. Only the 51st century would think to develop lipstick as a weapon... for men, too. Actually, it was Jack Harkness who introduced it to John.
* The BBC TV movie ''Film/TheYearOfTheSexOlympics''. Though actually about a lethal RealityTV show, the eponymous Sex Olympics is part of the BreadAndCircuses used to keep the masses entertained in this future dystopia.
* ''Series/TheManInTheHighCastle'': Berlin in the 1960s has developed a counterculture among the Nazi youth who indulge in casual sex and drug use. By contrast, the Nazi puppet state in the United States has a stronger emphasis on StayInTheKitchen values.
* ''Series/FutureMan'': In the future, sex is apparently so casual that it's just for "re-charging" before you go into battle. While Wolf and Tiger both say their sterile, there is a plot point that they aren't immune to [=STD=]s. However Tiger does say that one of their comrades died from AIDS, perhaps due to all the casual sex. Prior to the last mission, there's an orgy.

* In [[Music/JeffersonAirplane Paul Kantner's]] 1970 sci-fi concept album ''Music/BlowsAgainstTheEmpire'', this is one of the things the protagonists are seeking when they hijack a starship and set off to found a hippie utopia.

[[folder:Tabletop Games]]
* Ironically given how rigid Clan society normally is in ''TabletopGame/BattleTech'', Clan warriors pretty much practice this. The casual attitude they have regarding sex as simple off-duty recreation is specifically one of the things that make them seem more alien to the average citizen of the Inner Sphere; it helps that the ''upbringing'' of the average 'trueborn' Clan warrior is rather alien to anybody used to concepts like natural conception and birth (considered inferior to the default in vitro method involving the careful deliberate selection and use of genetic material donated by earlier generations) or traditional family structures (basically nonexistent unless one wants to count 'sibling companies') as well.
** To the point where terms related to conception, birth, childrearing, and parenting are so offensive to Trueborn Clanspeople that they can make them violently ill (emphasis on the "violent" part with the Warriors, who will answer accusations involving this functions by trying to kill their accusers.) Among the "Freeborn" (Clanspeople conceived and born the old-fashioned way), family units and such are much like they are in the Inner Sphere, but owing to the Clans' emphasis on creating the perfect warrior society, everything, even procreation in the lower castes, is seen as being in service to the Clan (making more Laborer/Techs/Scientists to support the Warriors). It's implied that even among the Freeborns, Clan society is something of a free love future: You're expected to have children with your partner (who the Scientists have verified will produce acceptable offspring with you), but you can fool around with just about anyone you want in your (very rare) free time.
* In ''TabletopGame/CthulhuTech'' casual sex is seen as perfectly normal, although most people use it as a way to eventually meet someone with which they want to have a monogamous relationship.
* ''TabletopGame/EclipsePhase'' has this as a characteristic of its immortal society. STDImmunity and easy contraception are, of course, among the basic modifications attached to any biomorph except the completely unfixed.
* ''TabletopGame/{{Numenera}}'' has some cultures fitting this trope.
* As the world of ''TabletopGame/TranshumanSpace'' is in many ways the present TurnedUpToEleven, with advanced medical technology, fairly relaxed sexual mores are generally assumed -- but are not universal everywhere.

* In ''VisualNovel/CulpaInnata'', the Union society has been restructured to be based on purely scientific principles. One of which completely dissolves the traditional family unit and the concept of marriage... sorry, a "[[YouKeepUsingThatWord nuptual agreement]]." People are expected to have multiple sexual partners, although you can have a primary sexual partner, which has no legal status. Also, for some reason, men are no longer the courtiers. Women are expected to ask men out and pay for dinners and the like. If a man starts hitting on a woman, she will usually leave in disgust. This can be a problem for immigrants from the "rogue states" (Russia, India, China, etc.), which still cling to old traditions. Phoenix even warns an Indian immigrant applying for Union citizenship, who confesses to having multiple affairs, while his wife couldn't due to a DoubleStandard stigma, that he should have no such expectations in the Union. Jealousy is never mentioned, as attachment is frowned upon. Phoenix also speaks with her best friend about nuptial agreements and the thought of being with the same person for more than a week, let alone decades, is disturbing, as boredom would set in.
** Of course, there are varying degrees to which people abide by this. Phoenix, for example, is pretty conservative by Union standards. While she frowns on long-term attachments, she never appears to have more than one partner at a time. Her best friend, though, appears to be more promiscuous (not that this word has any negative connotation in the Union) and her usual answer to Phoenix's problems is "YouNeedToGetLaid". The game involves Phoenix investigating the murder of a recent Union citizen, a Russian immigrant. While interviewing his "prime sexual partner", she finds out that the woman was his wife in Russia, but they were forced to annul their "nuptual agreement" in order to obtain Union citizenship. She appears to have remained faithful to the victim, while he was reported to having attempted to hit on several women. Given that women are expected to hit on men in the Union, all his attempts were unsuccessful.

* In ''Linburger'' all the DemiHuman races live a life of hedonism, with most having or seeking a primary partner, but exclusivity apparently the exception rather than the rule, and are (with some reason) stereotyped as being members of a religion built around it. Humans up on the surface, however, still seem to cling to their old notions of monogamy, but most find reason to nip downstairs and indulge their more libertine fantasies once in a while.
* What seems like a likely future (and even present) in ''WebComic/MenageA3,'' as seen in the page image (though that's from a doubly tongue-in-cheek guest strip).

[[folder:Web Originals]]
* Literature/ChakonaSpace seems to fit the description, at least as far as [[FunnyAnimal morphs]] and especially [[{{Hermaphrodite}} Chakats]] are concerned. And their human lovers usually learn to accept it, Admiral Boyce eventually has five wives (three cat-like aliens from two different species and two chakats).
** It was originally intended as a Star Trek fanfic.
** The Faleshkarti have the dystopian version, due to their biology. [[spoiler:While they're emotionally mature and quite intelligent at a young age, sexual maturity makes them wildly horny. And loss of virginity makes them stupid until they get pregnant. Therefore, once they're sexually mature, they're doing their damnedest to get knocked up.]]
* The online adult science fiction novel ''A Perfect World'' by Al Steiner depicts a future where all [=STDs=] have been eliminated, people are infertile until they decide they want to procreate (at which point they just go to the doctor and tell them they want their fertility activated), and open attitudes toward sex are the norm. As a result it's very common for people to "get acquainted with each other" by having sexual relations (sex in public places is legal, and nobody even bats an eye when it happens), and monogamy is considered a primitive and outdated concept.

[[folder:Western Animation]]
* In ''{{WesternAnimation/Futurama}}'', it was apparently so common for humans to fall in love with Sex Robots that the Space Pope ([[http://theinfosphere.org/File:Space_Pope.jpg Crocodylus Pontifex]]) and the Space Catholic Church had to produce [=PSA=] warnings against it. The idea was explored further in "Propositon Infinity," which revolves around an attempt to legalize robosexual marriage.
** This is hinted at as far back as the pilot episode, which has Bender hesitating to hang out with Fry because "I don't want people thinking we're robosexuals. If anyone asks, you're my debugger."
** ''Futurama'' went on to explore a "true" free-love future with ''The Beast With A Billion Backs.'' Everyone seems perfectly happy to exist like this, until mutually-exclusive bonds like friendship and love muck it up. [[HeroicComedicSociopath Bender]] delivers the show's SpoofAesop, claiming that love is, by nature, jealous, possessive and exclusive, and therefore "free love" isn't love at all.
** In one of the newer episodes it appears that "Robosexuality" is the 31st century equivalent of homosexuality. At one point it's stated that not only a man and woman are allowed to marry, but also man and man, fembot and manbot, interracial, interplanetary, and even a ghost and a horse.
** Prior to that, Farnsworth invokes a minor version of this trope, announcing that "your primitive notions of modesty" had been extinct for over eight hundred years, before [[NakedPeopleAreFunny stripping naked to play chess with Hermes.]]
*** Of course, he's also apparently been arrested for public nudity, and conspiracy to commit public nudity, so that may just be his opinion (or it's illegal for him, specifically).