Rape is probably the most common sexual fantasy for women. Romance novel writers have long used the standard "innocent girl taken by the sexy barbarian who would not be denied" trope. Yeah, it may be silly. But it sells.
As such, the popularity of 50 Shares of Grey with women should come as no surprise. However, when women fantasize of rape they imagine this:
A Chicago college student is behind bars while accused of sexually assaulting a 19-year-old woman during what prosecutors said was a "Fifty Shades of Grey" re-enactment.