This is in response to the story posted at http://www.solotouch.com/contri/exp/200301/22x60844.htm
I think you're both wrong. He for looking at underage porn. You are wrong in thinking that his porn and masturbation habits are wrong (the issues of child porn not withstanding).
Almost all guys masturbate, and most of them look at porn from time to time as well. Trying to stop it is futile. If you think a guy will immediately stop looking at porn and masturbating just because he's in a relationship, you're sorely mistaken. I would suggest bringing it in as a part of your sex life. Try masturbating together. You need only look through the archives of this site to find stories of how masturbation can greatly improve sex between couples. If you really want to get him away from porn, give him a live show. Or take some nude pictures of yourself (a digital camera and printer will allow you to do this without having to have a developer see the pics) and give them to him.
As for the kiddy porn, you're perfectly reasonable in thinking that he is a sick pig.