I've mentioned it before here. A couple of years ago there was a Swedish study where they asked 18 year old women if they had ever been the victim of sexual assault. Things like unwelcome groping was included. The result was 100% of all Swedish women had by the time they were 18 had at least once been the victim of sexual assault. And with our adamant stance on equaliy hammered into Swedish boys, I doubt Sweden is any worse than anywhere else. Quite possibly less sexual assault.
A bit simplistically put, if sexual assault leads to masochism and all women have been assaulted sexually, all women should be masochists. There must obviously be other factors at play. I mean, if a submissive/masochistic women would search her past and find an instance of sexual abuse and use that as an explanation, we are in fact only presenting an illusion of an explanation. No matter how severe the sexual assault was, we have in fact no reason to believe there's a connection.
http://en.wikipedia.org/wiki/Post_hoc_ergo_propter_hoc