D.S.
I have twin boys age 3 1/2. One plays with his privates and the other knows it's there but doesn't play so much (only in the bathtub, but can be easily distracted). My one boy grabs himself when his pull-up is off at bathtime or changing (he has no interest in potty training). Anyway, if I tell him to stop playing with his pee pee, he doesn't listen to me. He thinks it's funny. Then I get frustrated and upset and tension begins to rise between us. Perhaps I need to put some bathtoys in to play with. But then he just throws them out on the floor. My husband makes no big deal about it and tells him to stop playing with his pee pee and my son stops. Something about a mans voice that children listen to and obey. I probably did not help you out here, but to know you are not the only one out there with this issue. I look forward to reading the advise others have given.