Basic Trope: A human has sex with an alien.
- Straight: Bob has sex with Meteora.
- Exaggerated:
- Meteora is more of a Starfish Alien with Bizarre Alien Biology than a Green-Skinned Space Babe.
- Bob actually gets into a long-term relationship with Meteora, or even marries her and has Babies Ever After with her, rather than just having a one-night stand with her.
- Bob has a Long List of alien women he has had sex with over the years.
- Downplayed: Bob gleefully flirts across gender lines, but generally does not fling himself into bed without at least knowing what kind of genitalia his partner might have.
- Justified:
- Bob and Meteora are attracted to one another, and one thing leads to another.
- Bob is the victim of an Alien Abduction, and Aliens Made Them Do It, you know, For Science!.
- Inverted: An alien has sex with Alice, not Bob.
- Humans refuse to have sex with other humans.
- Subverted: Bob thinks Meteora is hot, but doesn't act on it.
- Double Subverted: Until she starts coming onto him, and soon enough they hook up.
- Parodied: Meteora gets pregnant with a Half-Human Hybrid, and expects Bob to pay child support (or marry her), even though he doesn't even know where her home planet is.
- Zig Zagged: Bob constantly oscillates between having sex with the alien ambassador and desperately trying to avoid them.
- Averted: Bob doesn't have sex with Meteora.
- Enforced: All Men Are Perverts, All Women Are Lustful
- Lampshaded: "So, I hear you did an alien chick... how was it? Was she hot?"
- Invoked: Meteora's spaceship crashes on Planet Earth, and Bob rescues her unharmed from the wreckage and falls in love with her.
- Exploited: The Handsome Lech is assigned to greet the ambassador in order to improve diplomatic relations. Or just keep the two of them out of the way for a while.
- Defied: Meteora (or Bob, or both) has reservations about having sex with a stranger (especially one of a different species) and/or is already Happily Married back home. Both of them have a conversation and agree not to pursue any desires they have.
- Discussed: Bob and Meteora talk with each other about their relationship.
- Conversed: Alice and Bob talk about two differently specied characters' relationship from the Show Within a Show.
- Deconstructed:
- Bob and Meteora could give each other all kinds of nasty sexually transmitted diseases (or even diseases in general) that neither species is used to, causing its demise. And there might be some... mechanical issues, depending on Meteora's Bizarre Alien Biology. Also, they could be seen as traitors to their species, and who said this sex was necessarily even consensual?
- Because they're different species, Bob and Meteora's relationship is considered the equivalent of zoophilia, and are treated as freaks by the public.
- Bob and Meteora are not interfertile, and so can not have children together. As they both want children, this is a bitter pill to swallow.
- Because of their different cultures, Meteora does not understand human sex and consent. Bob having sex with her is essentially rape.
- The context and behaviors are vastly incompatible - even if they understood each other there isn't much physical intimacy possible - let alone something both would enjoy or even notice. Blatant lewd behavior wouldn't even be noticed.
- Reconstructed:
- Bob and Meteora either control their sexual urges, or take precautions (i.e. Bob wears a condom) when acting on them.
- Bob and Meteora decide that what others think of them doesn't matter as long as they have each other.
- Bob and Meteora adopt.
- Bob explains consent to Meteora. She understands and has unambiguously consensual sex with him.
- Played For Laughs: Meteora is one of the Little Green Men.
- Played For Drama: Meteora rapes Bob, or vice versa.
- Meteora is on a mission to acquire an untainted sample Bob's semen for her kind to study, and is only letting him screw her so as to keep up the facade.
- Bob and Meteora's relationship is treated by Meteora's kind in the same vein that interracial marriage was treated during the American Civil War.
- Implied: Meteora and Bob are seem together with very little clothing, but it's not clear how far they got.
- Plotted A Good Waste: It's the set up for a half-human, half-alien son who faces Half-Breed Discrimination.
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