Does he know? Of COURSE he does!

If he hasn't done it deliberately then I've got three balls! He's got the option of, if someone comes up to him to tell him, he can claim that he's sorry but it must have just 'slipped out'. But I'm sure he'd rather it attracted someone he liked, with the possibility of it going onto something more interesting than just simply flashing, rather like a fish being lured with a bait.