My son is infatuated with his penis :(

[Naomi]

I've had this with my boys too.
I also tell them that if they want to play with "willy" they should do it in their room/bathroom because it's not nice for other people to see.
It seems to have worked so far

[~Raven~]

Angus is mad for his!

I just tell him that they are private and if he wants to look at it then go to his room and do so.
Also I have told him the same as Maz and said not to let anyone else ever touch it and to tell me or Dad if that happens.

[MantaRay]

I think this is very normal too. J plays with his too, has even put in undies on once so that it was hanging out the top LOL. Having only had sisters, this obsession is a little strange to me, but I am learning that it is just one of those male things.