well they said it was date rape so I dont think he would have been concerned about being recognised - she obviously would have known who he was by that point.
He might have not thought what he did was wrong (?) or might have thought she would not report it (?) or it never happened (?) or is he just a wanker and didnt care because he has an ego complex (?)
Either way this is the 2nd time he has been formally accused of it, once before and once after being famous and while it could be nothing I have to say I doubt it is - his attitude always seemed overly cocky and sexist anyway. But that's just my opinion!