My 7 year old son, has recently started rubbing himself down there quite a bit. I have asked him not to do it in front of people and to do it in bathroom. He shares a bedroom with his 3 year old sister until we move. I've walked in on him in the living room and he is also doing it in bed (luckily daughter asleep) . I have no idea what to do? He's rubbing quote hard down there and getting an erection. I assume it's not sexual at this age. I'm just at a lose what to do, how to stop him doing it inappropriately. any advice? Thanks.