Something no one told me about having boys:
One day, you WILL have to assist him in holding his penis while he pees somewhere, like on the side of a Mississippi highway. You'll most likely end up with pee all over you. He will get pee on one or both of his hands, and wipe them on your shirt.
Also ... it is kind of fun to see how far his pee will go and to see if he can hit an anthill. I am beginning to gain more and more insight into the mind of a man.