My DS1 is 5 and without meaning to he will not stop touching his willy. It is while he's dressed he constantly has his hand there and it's becoming embarrassing as people keep asking him if he needs the loo. I think now he's done it for quite a while it's become habit and I keep reminding him not to put his hand on it but within 5 minutes his hand has wandered back to his crotch! What can I do?