Well, actually I think it's applicable for the sexually repressed, too, though not all cases, of course. I'm trying to talk in tendancies and likelihoods rather than sweeping generalities and pigeonholing. :P I think for someone who's had a great deal of guilt and shame associated with sex while growing up, rape fantasy makes a safe outlet for desires that they aren't comfortable expressing otherwise. Removing control removes guilt and responsibility. LKH is a great example of this, since her "good girl" characters only experience what she views as perverse pleasures against their will, which means they stay good girls even though they're really doing a damn fine impression of a public utility.