There's a lot of nukige about a dude who gets revenge on girls by raping and torturing them lmao
And a lot where the protagonist is just a psychopath who rapes random women. For example, the "Rape! Rape! Rape!" series. Or other eroge where degenerate shit is casual as fuck, like the 0verflow universe (that dude who impregnated like 4 generations of his own offspring and like half of the cast is descended from him)
But there are dark eroge where you get a bad ending where you're killed or something equally horrible happens to the protagonist if you act like an asshole. I like those more.