If a woman came to you and said she fantasized about raping someone, how would you react? What if it was a man saying he fantasized about raping someone?
I don't think fantasies about being raped are uncommon or wrong. It doesn't mean the person wants to be raped, and I wouldn't think there was anything wrong with them, male or female
I would be a little disturbed by someone saying they fantasized about committing rape--moreso if that person was a male--but I don't think I'd really think less of them. Fantasy is fantasy, and not real.
I actually feel kind of bad for being more disturbed if the person who fantasizes about raping is male. I think it's because stereotypically it's the man who rapes the woman, and it's something that scares me.
I think the world of fantasy is interesting.