>>108679529Eh, it's a difficult one. Rapey villains can be incredibly disturbing - which can help the audience dislike the villain, but also mean that the occasional team-up with the villain (to defeat another villain) has some unfortunate implications.
For those reasons, Villains probably shouldn't be sexually aggressive towards a female protagonist.
On the other hand, if a villain is ok with murder, torture, poisoning thousands as part of his evil plot then why should rape be where he draws the line?
In a non-sexual sense, there are plenty of villains who want to torture any hero they capture - they finally get to pay the do-gooder back for all the times they humiliated them!
Of course, the hero gets away before the mutant-laser-sharks do more than nibble their costume, but still, they almost got eaten alive.
So a male villain who captures a female hero might want to rape her - seeing it as just another way of hurting/humiliating her.
And that's not counting all the crazy villains who think they're in love with her or destined to be together or whatever.
So rapey villains are, well, not 'realistic' but 'believable'.
Not all, of course, just some.
That none of them are, is a writer/editor choice, to prevent controversy.