I wouldn't consider daily masturbation an addiction. It's when your urge is so overpowering, that you find places to secretly do it (at your desk at work, in your vehicle driving home, etc.). Sure, sometimes it's fun to do those things just for the thrill, but when you make it a daily thing to do it several times a day in various different places, that's when it's an addiction.
Seeing as this post was dated originally in 2003, I'm not sure if the OP is actually still around.
