Our son is a teenager so guess whose job it has fallen to walk the dog every day. I sometimes tend to think that our son is the untrainable problem (not the dog). In my view, getting humped on the leg every once in a while is his just punishment for not diligently walking her.
Now that I know what it really signifies, maybe I'll rub it in a bit by telling him... ;-)
ROTFL!
Well, if he's a teenager, at least you aren't needing to be concerned about him getting hurt... The training wouldn't hurt though, the dog or the kid!