C.T.
I don't have a son, but I've taken psychology classes on child developement... they say that it's perfectly normal for young kids (boys and girls) to touch themselves. However, yes it can be inappropriate (like in public), but you should just tell your son that it's ok to touch himself, but for him to do it in private, like in his room. They say that it's not good to tell kids to stop touching themselves and to not tell them it's disgusting or bad b/c you don't want the kid to think that they're bad and also it can also make them feel weird/paranoid about private parts. Good luck!!