Since, as David Cameron says, "it's the boss who sets the culture", what culture is he setting, and what culture would he set as Prime Minister?
We know that he has at least once had cause to visit a "sexual health clinic". If he was the victim of some sort of assault, then fair enough. But he would probably have made the whole story about that specifically.
We know that he was a member of an organisation dedicated explicitly to the imprisonable offences of drunken and disorderly conduct, criminal damage and assault.
And we know that he refuses to deny that he has used Class A drugs.