>>716222297
it's considered weird now but cousin has been acceptable for most of human existence, it's barely incest.
Anyway I think the issue is that incest IRL is rarely about banging your hot cousin or having some lewd thoughts about your sister. Most of it is grooming, rape and long term sexual abuse or fucked up people in an unhealthy relationship in weird isolating circumstances like the game.
At least that's going to be the impression because if there's more sisterbanging going on you probably wouldn't hear about "good" incest anyway because who the fuck would admit they had sex with a sibling on a whim or something.