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Incest Is Relative

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"The family that LAYS together STAYS together!"
— caption of an unbelievably NSFW comic by Robert Crumb

Tropes relating to incest and its various permutations.


  • Brother–Sister Incest: Incest between brothers and sisters.
    • Big Brother Attraction: A younger sister is strongly attracted to her older brother.
    • Little Sister Heroine: A little sister who is a love interest.
    • My Sister Is Off-Limits!: A brother who bars anyone from dating his sister. May or may not be the result of him having a crush on her himself.
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    • Not Blood Siblings: It's okay for them to have sex if they're not biologically related.
      • Flirty Stepsiblings: A relationship between people who are only related because their parents got together before they did.
    • Twincest: Incest between twins.
  • Cast Incest: Related characters are played by actors who are lovers in real life.
    • Incestuous Casting: A couple is played by actors who are related to each other in real life.
  • Creepy Uncle: An uncle with an incestuous interest in his niece or nephew.
  • Incest-ant Admirer: When one relative is attracted to the other, but the other is uninterested.
  • Incest Subtext: Related characters have interactions that make them look like a couple.
  • Incest Yay Shipping: Fans ship characters who are related.
  • Kissing Cousins: Incest between cousins.
  • My Own Grampa: Someone uses time travel and incest to become their own ancestor.
  • Parental Incest: Incest between a parent and a child.
    • Lecherous Stepparent: A stepparent who is attracted to their stepchild.
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    • Oedipus Complex: A child is attracted to their parent.
    • Pervert Dad: A father who flirts with and/or acts pervy toward his kid.
    • Wife Husbandry: Raising someone solely so you can marry them once they're old enough.
  • Relative Error: Someone mistakes a relative for the person's significant other.
  • Royal Inbreeding: Only having sex with blood relatives to keep the bloodline pure (and all the bling and lands within the family).
  • Screw Yourself: Someone has sex with their own clone or other perfectly identical Doppelgänger.
  • Surprise Incest: A character enters a relationship with someone, only to later find out they're related.
  • Villainous Incest: The villain bones one of his relatives to show how vile and messed up he is.
    • Inbred and Evil: A villain who was conceived from an incestuous relationship.

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