->''"But that's mental! Why would any guy want to fuck his own mum?"\\
"Yeah. You hear about it on the news and stuff, though. [[ParentalIncest Mums who fuck their sons, dads who fuck their daughters and their sons.]] [[BrotherSisterIncest Brothers and sisters who fuck each other]]--"\\
"Language, please!" Miss Azley protests.\\
"That's bullshit. Who would want to fuck--sorry, screw--their own parents?"\\
"It's called incest, man."\\
"That's when a guy rapes his sister, dickhead."''
-->--'''Miss Azley's English class''', ''Literature/{{Forbidden}}''

Tropes relating to incest and its various permutations.

* BrotherSisterIncest
** {{Twincest}}
** NotBloodSiblings
*** FlirtyStepsiblings
** LittleSisterHeroine
** BigBrotherAttraction
* CastIncest
* CreepyUncle
* IncestuousCasting
* IncestSubtext
* IncestYayShipping
* KissingCousins
* ParentalIncest
** LikeParentLikeSpouse
** WifeHusbandry
** PervertDad
* RelativeError
* RoyalInbreeding
* SurpriseIncest
* VillainousIncest

If ''that's'' not incestuous enough, then ScrewYourself. When it's {{Subtext}}, rather than {{Canon}}, see IncestSubtext, for the shipping, see IncestYayShipping.
%%Not Safe For Granny.