Rape fantasy is bigger in sexually repressed cultures, though I'm not saying North American culture is sexually unrepressed, since we're pretty uptight in our own way. In some of these cultures, women are more intrigued by rape fetish becuase they've been indoctrinated to see any form of sexual desire as immoral, it goes with the sterotype that we see here in teh west that all women want sex, but are often too proud or self rightous to admit it.
This is more something I've had explained to me than something I've researched, so if you know something I don't know, let me in on it, please and thank you.