Rape fantasy is one which I have found is surprisingly common to women I have spoken that intimatly with. No, they don't want it to happen in RL, but many have confessed they are aroused by the thought of being abducted, and gang raped repeatedly.
Abhorant in RL, but hey - that's what the stuff of fantasies are made of: What we can't have, what is taboo, what is socially unacceptable...