I have read the whole thread, and at times everyone's opinions on the type of men that rape etc seem to have crossed several times.
It seems to me that rhubarb's point is that most men are respectful of women and wouldn't under any circumstances try to have sex without her full consent. Some men, however, don't have that same respect, and under a given set of circumstances would ignore an initial "no", or assume that if she's naked in his bed she clearly wants it.
This, in my opinion, is the difference between men who would and men who wouldn't, and I think it is connected with the rape culture that's been talked about a lot here, whereby it's fine for men to joke about it etc.
So yes I think there are differences that set apart potential rapists from the majority of men, but those men could be perfectly 'normal' on the surface, and the majority of the time you wouldn't know he was capable of it.
Is it this simple question of whether there's a difference between a 'normal man' and a potential rapist that is the root of this argument? Or have I missed something?