[[quoteright:220:[[Webcomic/NerfNow http://static.tvtropes.org/pmwiki/pub/images/orks_3430.jpg]]]]
[[caption-width-right:220:[-[[VideoGame/WorldOfWarcraft Orcs have "needs" too, you know...]]-] ]]

->'''Oswald:''' Forget it. I don't wanna talk about this.\\
'''Lewis:''' No, no, I'm curious. Let's say you're in prison, and you're not getting out for a very long time. Plus, your parents? ''Very'' understanding. Who's your cellmate?\\
'''Oswald:''' ...Creator/LiamNeeson.\\
'''Drew:''' (''wrapping an arm around Oswald's shoulders'') Aye, laddie!
-->-- ''Series/TheDrewCareyShow'', first episode

A character's assumed actual romantic preference or even sexual orientation is made moot because of the setting or limitation of the plot. This frequently occurs with characters stuck in a [[ChromosomeCasting gender]]-[[EconomyCast biased]] population. (see: BishoujoSeries and CastFullOfPrettyBoys). Even if there's a theoretical pool of candidates off-screen, savvy writers know the audience likely doesn't care. This arises when writers apply standard romantic tropes to quirkier settings without major modification and without the explicit intent to make a plot point about it. If the situation developed after the plot is well underway, this may also be SuddenlySexuality, or at least played as such.

Some writers are fully aware of the implication and [[{{Squee}} the fandom]] it produces and might cater to both sides of the topic, making one character very enthusiastic about the idea, while one is humorously much more hesitant.

A common by-product of this trope is the rejection of a newly introduced 'common' romantic prospect, not because of a strong pre-existing fanship, but simply that they never reach the popularity of the existing cohort.

Not to be confused with IfItsYouItsOkay. For particularly cliched situations where this may occur, see SchoolgirlLesbians and HelloSailor.
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!!Examples:

[[foldercontrol]]

[[folder: Anime and Manga ]]

* ''LightNovel/MariaSamaGaMiteru'' is the famous all-girls example. Though it has a nearby all-boy's school, that's mostly used as a plot device rather than any real threat to the shippers. Its male-oriented [[DuelingShows demographic twin]] ''LightNovel/StrawberryPanic'' pretty much abandons that idea.
** And the two lead characters avert the trope entirely: they are quite thoroughly lesbian, as illustrated by the manga's epilogue that takes place after high school.
* ''VisualNovel/GakuenHeaven'', ''LightNovel/{{Sukisho}}'' and ''Manga/HanaKimi'' for [[BoysLove BL]] versions.
* ''Anime/MaiOtome'' establishes via TechnoBabble that the girls' [[VirginPower Otome powers go away]] if they have sexual relations with men. This is odd in that male characters are still around, and with one exception, none of them are involved romantically with other Otome, presumably so that the writers didn't upset the sizable {{yuri fan}}base.
** It's heavily implied in-universe that the inventors of the system that gives them their powers did this on purpose, although whether its because they're idiots, {{Yuri Fan}}s, or there was some other consideration involved, is never made clear.
* Everyone in ''{{Simoun}}'''s world is female until age 17, which makes all teenage romance SchoolgirlLesbians by default.
* ''{{Vandread}}'' reverses it. The two cultures start off unfamiliar with the idea of gender at all, but when encountering each other for the first time, some of the women and all three of the captured men turn out to be straight (or at least bi). Not that they have any idea ''why'' they find the "[[MarsNeedsWomen aliens]]" more attractive than their own kind...
* ''Anime/SaberMarionetteJ'', where the world is all male because the only survivors of the spaceship crash were male, and since not-so-logically everyone is a clone from the DNA of those six, there aren't any women. If they can do cloning, why can't they do X-chromosome duplication? Never mind. Oddly enough {{Robot Girl}}s in the series are mostly treated as impressive machines, but Hanagata is the only real [[PetHomosexual obviously gay]] character. It ''is'' {{shonen}}, after all. The manga states outright that lack of women is the reason for most of the homosexual relationships on Terra 2.
* Indirectly affects ''Anime/YuGiOh''; no doubt one of the main reasons there's so much [[EveryoneIsGay Yaoi Fic]] in this fandom is the [[CastFullOfPrettyBoys dearth of female characters]] and overabundance of {{Bishonen}}.
* One storyline in the manga ''[[LegalDrug Gohou Drug]]'' involves the characters infiltrating an all male boarding school, where almost all the guys are gay simply because there are no girls around. One student even explains this trope directly to the main character.
* The Arume in ''BlueDrop'' form a [[OneGenderRace race that only consist of women]], but they manage to produce offspring with the aid of technology. After conquering the earth they ''still'' appear to be mostly interested in the women though.
** Also happens with Earth's people in the manga, ''Tenshi no Bokura''. The Arume keep the humans segregated by gender, so the girls grow up lesbian due to Arume... influence. Males resort to homosexuality out of necessity, although one of a pair often crossdresses.
* There is absolutely no appearance or mention of any female in BoysLove anime ''LightNovel/{{Sukisho}}'', and the Valentine's Day episode shows many gay couples walking around. There is no explanation for this, females simply seem to not exist. The lead character's reaction to gayness still goes from absolutely-unbothered to completely-freaked-out (and oblivious-to-his-roommate-in-denial).
* In ''{{Ooku}}'', the titular Inner Chambers of the female Shogun's palace are rife with male homosexual behavior; from late night "[[PrisonRape hazing]]" of newcomers to {{Bishonen}} sleeping their way into better positions to rather ordinary romances and crushes. This is all the more surprising to newcomers to the Shogun's service because the gender ratio outside the RoyalHarem is [[{{Gendercide}} severely skewed]] [[LadyLand in favor of women]] and the lack of men makes sperm worth its weight in gold, impossible to imagine wasting on coupling that will never produce a child. Meanwhile, many merchant and peasant women lust after male-impersonator kabuki actresses because men that attractive are completely out of their price range, and noblewomen often have lesbian romantic and sexual relationships because their arranged marriages are purely for conceiving female heirs.
* ''Manga/AxisPowersHetalia''. Female countries ''exist'' and will often get attention or give attention to the male characters, but they're few and far in between.
* ''VisualNovel/TogainuNoChi''
* ''Manga/JyuOhSei'': Women are very scarce on Chimera, and tend to live separately from men. As a result, a lot of otherwise straight men aren't against going for the next best thing (read: [[EvenTheGuysWantHim Thor]]).
* An example of either this or BiTheWay appears in ''Manga/BlackLagoon'', Revy states that she had sex with women in prison, however, her love interest is a guy. Fans debate whether her interest in women extends outside of prison, since in context she was referencing being with women as a threat to make another woman her bitch for making a pass at said male love interest.
* ''LightNovel/AiNoKusabi'' has homosexual relationships being very common because [[SlidingScaleOfGenderInEquality women are rare]].
* In ''Anime/NeonGenesisEvangelion'', Shinji has some HomoeroticSubtext with Kaworu. Although Shinji's sexuality is never stated, one possibility is that he's straight but too lonely to care that the only person to show him some affection happens to be an AmbiguouslyGay boy.

[[/folder]]

[[folder: Comic Books ]]

* In ''YTheLastMan'', a lot of women are with other women as a substitute, but a lot simply go without, as many of them had before the "{{Gendercide}}".
* Writers of ''WonderWoman'' throw around hints that Themyscira has embraced this sort of mindset: some of the women are chaste, some of them are seeing [[ADateWithRosiePalms Rosie Palms]], and the rest pair up.
** The more juvenile writers, usually the ones who get a chance to briefly play with the character in another title, throw around hints. The main series itself has straightforwardly confirmed it multiple times, though quietly.
** Diana does some traditional courtship rituals with her boyfriend Nemesis, he asks how a society of only women has such things.
** A throwaway line a while ago basically said Queen Hippolyta is in a relationship with General Phillipus, and WordOfGod confirmed it (as well as the fact that they intended to do a storyline where they got married before [[ExecutiveMeddling the editorial axed it]]).
* The ''[[ComicBook/BuffyTheVampireSlayer Buffy The Vampire Slayer Season Eight]]'' comics:
** Buffy, who is surrounded by fellow slayers (all women) and [[TheOneGuy Xander]], hooks up with fellow Slayer Satsu. It is shown as a result of Buffy feeling emotionally isolated (not to mention sexually-deprived), so she latches on to Satsu (who is genuinely in love with Buffy). This is similar to her relationship with Spike, where she also chose a unusual partner ([[OurVampiresAreDifferent a soulless corpse]] in that case) who was genuinely in love with her, in order to satisfy her (purely physical) needs (though at least Satsu she liked and respected, while she frequently professed outright disgust and rage at Spike during season six).
** Hilariously, it was ''Satsu'' who broke off the relationship with Buffy... and then spent an entire issue [[{{Wangst}} wangsting]] about Buffy rejecting her, despite this never having actually happened. Although, each time they slept together, Buffy kept saying that it was a mistake that should never have happened and [[ItsNotYouItsMyEnemies it was dangerous for her to get romantically involved with anyone.]]
** Buffy also realized that she was staring to have feelings for Xander, who had been a HopelessSuitor to her in the past. Unfortunately, [[UnrequitedLoveSwitcheroo he was already dating]] her younger sister Dawn by that point.

[[/folder]]

[[folder: Fan Fic ]]

* With a setting that includes only '''two''' canonical male characters (and only one of them is even given a name!), this trope grows like kudzu in the ''VideoGame/{{Touhou}}'' fandom.
** That being said, [[AllThereInTheManual ''Perfect Memento in Strict Sense'']] illustrates (literally) that there are males in the human village. Whether or not any of the {{youkai}} girls would be interested (although the presence of [[HalfHumanHybrid Rinnosuke]] would indicate it's possible), the human characters should have their pick of straight options. [[GirlOnGirlIsHot However...]]
* ''Literature/LordOfTheFlies'' fanfiction is often subject to this, since there are no female characters...period.
* The ''VideoGame/TeamFortress2'' characters are seen (and promptly used) as such. As best said by Kytri, author of ''Webcomic/CuantaVida'', "I think of most of the characters as being straight, you just wouldn't notice since there's no women around for them to be straight with."
* ''[[http://fma-fic-contest.livejournal.com/241159.html ISHBAL! The Musical!]]'': ''Desperate Times'' is just full of this.

[[/folder]]

[[folder: Film ]]

* Every [[BMovie B-movie]] [[GirlsBehindBars women-in-prison]] flick ever made. (And a few of the men.)
* Referenced in ''Film/TheLongestYard'' (2005).
-->'''Caretaker''' (On the CampGay prisoners) - "Oh, they ugly now, but in eight months, ''he'' gonna look like Beyoncé."
* Referenced in ''InAndOut'':
-->'''Jack''': There's only two times when [[HoYay that kind of thing's]] okay: In prison where it's a substitute and guys in space.
-->'''Mike''': Guys in space?
-->'''Jack''': Well, not on purpose. They just float into each other.
* There is evidence that both Jangle Leg and Biscuit in the movie ''{{Life}}'' are only together due to long prison terms and this trope. Jangle Leg is shown to be attracted to women (when they're around) and Biscuit can't bear to go home to his mom "like this", implying that he wasn't always gay (and flamboyant.)
* The Decadents in {{Sexmission}} don't really have a choice. Once the Pill wears off, their sexual drive returns and there aren't any men around to hook up with. Come to think of it, if they were aware of Max and Albert, they still wouldn't know what to do with them, since there haven't been any men around for generations.

[[/folder]]

[[folder: Literature ]]

* In the ''Literature/{{Discworld}}'' series of books, dwarves embody this through most of the series. Both male and female dwarves wear the same clothes, have beards and so forth. Therefore, courtship for dwarves is described as delicately finding out the sex of a fellow dwarf. This starts to change through one female dwarf taking on TertiarySexualCharacteristics and identifying as female, causing a large uproar in the dwarven community.
* Rather baselessly averted in Creator/JohnWyndham's ''Consider Her Ways''. In the aftermath of a virus wiping out all men, a basically sexless society emerges. Wyndham seems to have utterly dismissed the possibility that women could form romantic relationships with each other, despite making a reference to Creator/{{Sappho}} at one point. He admitted that he put plot ahead of common sense in that one and seemed to regret it. Happens to the best of us.
* ''Literature/TheThinRedLine'' (the James Jones book that Terrence Malick's famous film is based on) discusses this notion and has several examples among its cast of characters.
* ''Literature/TheWheelOfTime'' has what are euphemistically referred to as "pillow friends", especially among initiates in the White Tower, where girls are isolated from men (and the world altogether) and would have problems anyway due to their powers and extended lifespan. Treated as a very private matter and not looked down upon, most of these relationships dissolve upon completing the long training process, anyway, though not always. See also SchoolgirlLesbians. All of the all-female organizations have some mention of this. Complicated by the fact that "pillow friends" can refer to a platonic friendship, since sharing a bed isn't always sexual--it's just as often that one of the friends has been punished and wants to cry herself to sleep on a friend's shoulder.
** A comparably ''extremely'' brief allusion to a male equivalent in TheEmpire's military companies occurs in ''Knife of Dreams'' during Tuon's point-of-view. Enough to get the idea that it exists, but [[AuthorAppeal the author isn't as interested in writing about it]].
* In TanyaHuff's ''Enchantment Emporium'' the Gale clan usually [[IncestIsRelative keeps things in the family]] and there are more female Gales than male so they tend, in the words of one of them, to be "enthusiastically undiscriminating".
* The implications of this going on for generations are considered as a minor theme in Creator/RobertAHeinlein's ''Literature/TheMoonIsAHarshMistress.''
* This has been a problem in the past at the main character's boarding school in ''Literature/TheConfusionsOfYoungTorless'', initially part of why he doesn't intervene in the [[MindRape mistreatment]] of his classmate Basini.
* Possible case with Daenerys Targaryen of ''Literature/ASongOfIceAndFire'', who becomes intimate with her handmaiden Irri. She wasn't exactly short on men at the time, but rather men who she trusted.
** Cersei ends up bedding (to some degree) one of her female friends, but she finds no pleasure in the act.
* The planet Athos in the ''VorkosiganSaga''. Originally founded as a [[CultColony "monastery planet"]] by a religious cult who believed that women were the cause of all male sin, it has since evolved into a society where most men pursue non-religious professions. Reproduction is accomplished via UterineReplicator technology. However, their religious culture forbids even depictions of women and censors all Galactic media. Thus most Athosian men will never even ''see'' a woman, nor have their ancestors going back generations. Homosexual relationships are therefore the norm, although some men, implied to be strongly heterosexual, remain celibate instead.
* This is implied to happen a lot in the society of the Masters in ''Literature/TheStoneDanceOfTheChameleon''. The Masters place a tremendously high value on blood purity, so much so that their women are not allowed to leave their house, except when they get married off and are instead kept at their husband's house. As such, males often form very intense emotional and sexual relationships with each other.
* ''Literature/SwordAtSunset'': A BattleCouple of cavalry captains tried it out while on campaign and never looked back.

[[/folder]]

[[folder: Live Action TV ]]

* One character attempted to use this as an excuse in ''Series/KrodMandoonAndTheFlamingSwordOfFire.''
-->'''General''': "Do you have ''any idea'' how long I've been in that dungeon?"
-->'''Krod''': "Yeah. Two weeks. And it's co-ed, so..."
* The prison variant is discussed on ''Series/TheSopranos''.
-->'''Tony''': Well, what are you gonna do? There's no women there! You're there five, ten years! ({{Beat}}) Just for the record, my incarceration was very short term, so I never had any need for any anal-- you know. (...) You think I'm lying, don't you?
* T-Bag on ''Series/PrisonBreak'' was very interested in his fellow male prisoners while behind bars, but as soon as he got out he seemed far more interested in women.
** The actor has described him as being an AnythingThatMoves kinda guy.
* ''Series/{{Oz}}'', being an HBO show set in a men's prison, was just as chock full of this trope as you'd imagine. Possibly more.
* Curtis/Melissa on ''Series/{{Misfits}}''. Curtis is straight. Melissa's a lesbian. [[spoiler: [[GenderBender They're the same person.]] ]]

[[/folder]]

[[folder: Music ]]

* If this isn't what ElvisPresley's "Jailhouse Rock" is about, then what the hell ''is'' it about?
-->Number forty-seven said to number three:
-->"You're the cutest jailbird I ever did see.
-->I sure would be delighted with your company,
-->come on and do the Jailhouse Rock with me."
** The writers (and by their account Elvis himself) knew this was a gay line and thought it would be funny to put it in [[GettingCrapPastTheRadar and see what happened]]. They said they put in lots of stuff like that, because they knew Elvis wouldn't have a problem with it.

[[/folder]]

[[folder: Stand Up]]
* Referenced in ''Creator/MitchBenn is the 37th Beatle'', when Mitch is talking about the criminalisation of homosexuality "because as we all know, the way to stop people being gay is to put them in prison."
[[/folder]]

[[folder: Video Games ]]

* ''VideoGame/WorldOfWarcraft'' and indeed the entire Warcraft lore makes it fairly clear that all male Night Elves went into the [[LayeredWorld Emerald Dream]], while the females stayed in the material world. For several thousand years. Even after the awakening of the males, [[spoiler: and the destruction of the world tree]] stripping the Night Elves of their immortality, there are hints and fluff pointing to this trope being in effect for the females at the very least.
* This, with a side order of PrisonRape, is how ''{{Enzai}}'' justifies its sheer number of possible homosexual encounters. What makes it all the more cruel is that the protagonist is genuinely gay.
* Morrigi in ''VideoGame/SwordOfTheStars'' live their entire lives in a gender-separated society where the females live on planets and the males operate the starfleet, the two only rarely meeting for mating contracts. The game mentions off-handedly that the only 'stable' Morrigi relationships are homosexual ones.

[[/folder]]

[[folder: Webcomics ]]

* Toyed with in the NoFourthWall webcomic ''[[OneOverZero 1/0]]''. Marcus, existing in a world consisting of only male characters, has no concept of women and tries to flirt with the guys instead. [[WordOfGod Tailsteak clarifies]] that Marcus isn't gay, "he's just settling for second best," then introduces a female character to clear things up for Marcus. (Said female character ''is'' gay, just to annoy the cast.)
* More or less the same situation as ''YTheLastMan'' exists in the webcomic ''Webcomic/{{Angels 2200}}''.
* WordOfGod is that all Erogenians in ''TheChallengesOfZona'' are "situationally bisexual".
* Thief and Fighter have a little discussion about this and elven prisons in ''WebComic/EightBitTheater''.

[[/folder]]

[[folder: Web Original]]
* Played with in the Netflix original series ''Orange is the New Black'': protagonist Piper Chapman is definitely bisexual, and was involved with another woman in the past, but is engaged to a man at the time she goes to prison. In prison, however, she gets involved again with her old lover (also in prison). Another inmate, Lorna Morello, was also engaged to a man prior to her incarceration, but got involved with fellow prisoner Nicky Nichols, but breaks up with her out of guilt at being unfaithful. It is implied, however, that Morello is kidding herself that her engagement is still on, as her fiance has not visited or otherwise contacted her since her third week in prison, and that her real reason for the break up is her issues over her sexuality, that is, that she's telling herself that she's not really gay. Finally, it is implied by one prisoner, Carrie "Big Boo" Black, that her former lover, Mercy, was not really gay, although whether that was true or was only an expression of jealousy over the fact that Mercy had left her for another prisoner, Tricia Miller, is debatable; Mercy quickly lost contact with Tricia following the former's release.
[[/folder]]

[[folder: Western Animation ]]

* The presence of romance in most ''Franchise/{{Transformers}}'' continuities combined with the fact that about 90% or more of the Transformer population is male leads to the insinuation that many Transformer romantic relationships must be male/male by default. [[http://tfwiki.net/wiki/Tidal_Wave#Energon The canon doesn't help.]] [[http://tfwiki.net/wiki/Sunstreaker#Dreamwave_comics_continuity At all.]]
** And on the other gender of that age demographic, most ''Franchise/MyLittlePony'' shipping is between females, because of similar logic.[[note]]Male characters are often shipped with other males, but that might be for a [[HetIsEw different reason.]][[/note]]
** Present to a lesser extent in Friendship is Magic...where there ARE at least a decent amount of male/female shipping in fanfics.
* Subverted in the ''WesternAnimation/FamilyGuy'' episode "Perfect Castaway". Peter is stranded on an island with Quagmire, Joe, and Cleveland. Noting that there are no women and [[AllMenArePerverts men have needs]], he says they need to have an orgy. Cut to a shot of them piled on top of each other...and no one is horny.
* Atlantis in ''WesternAnimation/UglyAmericans'' turns out to be an entire UnderwaterCity of this. Women don't have enough testosterone to survive the pressure down there, so they make do.

[[/folder]]

[[folder: Real Life ]]

* The old [[HelloSailor Royal Navy]] was famously rife with "rum, sodomy, and the lash", and not all prison sex is PrisonRape. Until anti-sodomy laws were struck down in Britain, the only time that "buggery" was legal was "after ninety days at sea," at which point it was no longer a crime.
** As TheOnion blurb in ''Our Dumb Century'' for August 15th, 1954 put it: "Let's Work Together to Pretend Our War-Time Homosexual Experiences Never Happened".
** Old joke about life on submarines, "150 people go down, 75 couples come up"
** Hence the phrase "Prison Gay", with the con asserting, despite the evidence, "I'm not gay"
** The ruggedly heterosexual Christopher Hitchens wrote about [[http://gawker.com/5504032/ his gay experiences at boarding school]], and maintained that everyone was at it, and anyone who said otherwise was lying.
* As also noted in EveryoneIsBi, many non-Western societies do not have much concept of "sexual orientation" as an immutable personal attribute and/or as a category distinct from gender. If such societies place high value on gender segregation or same-gender romantic friendships, they also often have a lot of situational homosexual ''behavior'' by people who otherwise appear to be purely heterosexual.
* [[http://en.wikipedia.org/wiki/Situational_sexual_behavior The Other Wiki on the subject]]
* Parthenogenesis: essentially, the female's eggs contain both X chromosomes. There are several species of lizards that ONLY produce offspring this way (no males). In fact, one female will mount another, which increases fertility.
** Others, due to the way that reptilian genetics can work, produce only males through this method.
* Plus bison and other animals with sex-segregated herds. You can only go so long without!
** For that matter, [[http://www.scientificamerican.com/article.cfm?id=bisexual-species homosexual behavior is much more common among zoo animals than among the same species in the wild]], and is even displayed in captive species that in the wild are rarely or never homosexual (such as koalas). The same article briefly discusses this trope as applied to humans--40% of high school football players admit to having engaged in same-sex kissing or similar acts.
* While in heat, female rats and mice will often start humping each other in the absence of males. [[http://www.youtube.com/watch?v=HahZhRRtb0Y&feature=related Ahem...]]
* Apparently cows have been known to mount each other while in heat, so much so that someone once invented a device which was glued to a cow's hind quarters and which popped up a little flag when such mating had taken place, as a sign to the farmer that it was time to fetch the bull.

[[/folder]]

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