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[[quoteright:348:[[WesternAnimation/{{Shrek}} http://static.tvtropes.org/pmwiki/pub/images/Shrek_01_350_5696.png]]]]
[[caption-width-right:348:Don't say [[http://static.tvtropes.org/pmwiki/pub/images/donkagon_6290.JPG donkagon]]!]]
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A romance, sexual or otherwise, between two different species. Sometimes they are humanoid aliens, and a GreenSkinnedSpaceBabe is involved, or they can be a FriendlyNeighborhoodVampire and a human, two {{Funny Animal}}s, or a BeastAndBeauty couple. The type of species can diverge greatly, so long as they are different.

May include a moral about the FantasticRacism version of inter-racial romances. Also may be StarcrossedLovers, anyone looking for more built in angst will make one of these a MayflyDecemberRomance. In [[MohsScaleOfScienceFictionHardness less realistic]] settings, can easily result in {{Half Human Hybrid}}s or {{Hybrid Monster}}s.

Chances of it actually becoming an OfficialCouple (and evolving into a mixed marriage) are increased if the nonhuman has a [[HumanAliens human form]], although that still doesn't take away the {{Squick}} for a steadfast minority of viewers. Most people accept it, though, if there are ''no'' humans involved, just two different animals. And since humans are animals, this can also be used to examine popular notions about [[WhatMeasureIsANonHuman morality]]. For anthropomorphic animals, this can be a source of FurryConfusion, especially if they're the ''only'' couple seen to be of different species.

For some this is [[BoldlyComing the way to go about First Contact]]. [[AlienInvasion Alien invaders]] seemingly love to tempt humans with this as part of their {{Masquerade}}, although [[HowToInvadeAnAlienPlanet you'd think they'd learn better]].

A lot more likely to happen in fan works (FanFic, WebComics, etc) and more likely to be...um...[[NotSafeForWork NSFW]].

See also: ExtremeOmnisexual; BestialityIsDepraved; MarsNeedsWomen; DivineDate; MagicalGirlfriend; DeusSexMachina; DidYouJustRomanceCthulhu; BoyMeetsGhoul; {{Robosexual}} (for when the "species" barrier is a robot, AI, or other artificial lifeform), and HotSkittyOnWailordAction for when you wonder how these two things could actually reproduce. May involve ExoticEquipment or the MaleToFemaleUniversalAdaptor. May lead to {{Half Human Hybrid}}s or to a NonhumanLoverReveal if one member was keeping secrets. If society does not approve of such romance, then it's also MalignedMixedMarriage. InterspeciesFriendship is the platonic version of this trope.

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!!Examples:

[[index]]
* InterspeciesRomance/{{Advertising}}
* InterspeciesRomance/AnimeAndManga
* InterspeciesRomance/{{Apparel}}
* InterspeciesRomance/ComicBooks
* InterspeciesRomance/{{Fanfic}}
* InterspeciesRomance/{{Film}}
* InterspeciesRomance/{{Literature}}
* InterspeciesRomance/LiveActionTV
* InterspeciesRomance/{{Music}}
* InterspeciesRomance/MusicVideos
* InterspeciesRomance/MythologyAndReligion
* InterspeciesRomance/TabletopGames
** InterspeciesRomance/DungeonsAndDragons
* InterspeciesRomance/{{Theatre}}
* InterspeciesRomance/VideoGames
* InterspeciesRomance/VisualNovels
* InterspeciesRomance/WebAnimation
* InterspeciesRomance/{{Webcomics}}
* InterspeciesRomance/WebOriginal
* InterspeciesRomance/WesternAnimation
[[/index]]

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