DS1 (4) is very impressed with his willy. He wants to pull the foreskin back and look at his glans. Which is fine, really, it's his willy. It just looks like it really hurts to do that! He's always been quite rough with his bits.
(I'm taking the line: that's something you play with on your own, which seems to be going down ok. I don't want to say it's wrong, obviously.)
Does anyone else's son do this? Is there any risk of him hurting himself this way?