I think that I read in an article somewhere that this was basically the reason why some women have “rape fantasies.” It’s a way of having your cake and eating it too. The female character is having sex (although maybe I shouldn’t describe it that way, since many object to using that phrase when describing the experience of a rape victim), but instead of actively pursuing it or flirting her way to get it, it’s forced on her. If she did actively pursue it, she’d be a “bad girl,” but since she doesn’t, she’s a “good girl.”

In a way, it’s kind of like the standard Reluctant Hero reaction to fame and wealth. The hero can’t appear to be too happy about gaining riches, otherwise he’d look greedy. He can’t appear to be too proud of himself for being the Chosen One, otherwise he’d look conceited. He has to be reluctant, so that he looks humble. In Anita’s case, she has to appear reluctant to have sex, otherwise she’d look lecherous (not that she isn’t).