Adult Forum sounds like it'd be fun and Peta-Sucks did the shop thing (a lot of us enjoyed it, but some people were too immature to handle it) and it was a blast. Also, implement a Karma system. How it works is if a member likes your post or dislikes it, they can give you a reputation/karma point for it or smite you for it. You'd have a little +/- below your name and stuff.