->''"The family that LAYS together STAYS together!"''
-->-- caption of an unbelievably NSFW comic by Creator/RobertCrumb

Tropes relating to incest and its various permutations.
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!!Tropes:
[[index]]
* AlternateSelfShipping: Shipping a character with an alternate duplicate of themself.
* BigBrotherAttraction: A younger sister is strongly attracted to her older brother.
* CastIncest: Actors who are lovers in real life playing relatives.
* FatherIWantToMarryMyBrother: Little kids telling adults they want to marry a sibling.
* InbredAndEvil: A villain who was conceived from an incestuous relationship.
* IncestantAdmirer: When one relative is attracted to the other, but the other is uninterested.
* IncestStandardsAreRelative: What counts as incest differs between cultures and across time periods.
* IncestSubtext: Related characters have interactions that make them look like a couple.
* IncestuousCasting: Actors who are relatives in real life playing lovers.
* IncestYayShipping: Fans ship characters who are related, especially twins.
* LittleSisterHeroine: A little sister who is a love interest.
* MistakenForIncest: A duo is mistaken for an incestuous couple, but are not.
* MyOwnGrampa: Someone uses time travel and incest to become their own ancestor.
* MySisterIsOffLimits: A brother who bars anyone from dating his sister. May or may not be the result of him having a crush on her himself.
* NotBloodSiblings: It's considered okay for them to have sex if they're not biologically related (although in some cases it's still considered wrong or icky, especially if they were raised as siblings).
* PsychosexualHorror: A subgenre that explores psychosexual development as a subject matter, including themes of sexual development and sexual activities.
* RelativeError: Someone mistakes a relative for the person's significant other.
* SurpriseIncest: A character enters a relationship with someone, only to later find out they're long-lost relatives.
* WifeHusbandry: Raising someone so you can marry them once they're old enough.

!!! Demographics incest is associated with
* DivineIncest: Incest amongst the gods in mythology.
* HillbillyIncest: Incest amongst poor, rural people.
* RoyalInbreeding: Incest amongst royals to keep the bloodline pure (and all the bling and lands within the family).
* VillainousIncest: Incest amongst villains to show how vile and messed up they are.

!!! Types of kin
* BrotherSisterIncest: Incest between siblings. (Despite the name, allows both hetero and same-sex incest.)
* CreepyUncle: An uncle with an incestuous interest in his niece or nephew.
* FlirtyStepsiblings: A relationship between stepsiblings who became stepsiblings after puberty.
* KissingCousins: Incest between cousins.
* LecherousStepparent: A stepparent who is attracted to their stepchild.
* ParentalIncest: Incest between a parent and offspring.
* PervertDad: A father who flirts with and/or acts pervy toward his kid, usually a teenage daughter.
* RetroactiveStepsiblingRelationship: Two people get in a relationship first, and ''then'' their parents get together.
* ScrewYourself: Someone has sex with their own [[OurClonesAreIdentical clone]] or other perfectly identical {{doppelganger}}.
* {{Twincest}}: Incest between twins.
[[/index]]
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%%Not Safe For Granny.