The thing with finding a mentor and all that jazz is he doesn't see it as being wrong, or a sin. Granted, i haven't pushed the subject very hard yet and i am planning on doing it, but i'm still reading up on the stuff on CF. Since he doesn't really see it as being wrong, i don't think he'd lie about looking at porn.
I, personally, believe that it's wrong to do and is sinning against God, but i have to convince him of it and unfortunately he's so darn smart it can be hard to do. I know you're all going to ask this, yes he is a christian...a liberal (sp?) christian, but still a christian.