>>717591219incest partly the taboo partly because i mean, who loves you more than your own mom could? It's already an unconditional love the only thing missing from it is sex. Add sex and you literally have the ideal
rape is just fun sometimes. A power thing I suppose.
NTR? Depending on the flavor, and what you choose to focus on, you have people that decided to wallow in their misery so hard that they decide to get off to it, a power fantasy, or just plain sexual misogyny.
the others you mentioned though, those are just stupid, there is no reason it's just fucked up brain wiring