I assume they're not fantasizing about a man jumping out of the bushes and assaulting them sexually. If they are, that would surprise me.

???

No that is literally the kind of fantasies that many women have. Easy to verify from their erotic fiction, magazine articles, online discussion boards, and from simply roleplaying with them.

But ernsithe is right, that doesn't mean they actually want to be raped. Fantasy <> Real Life.