Well, the problem is, bare chested women (or more) can create a situation that's bad for our image.
Racey noseart and stuff like that is historical and not a problem, but posting pics of naked people is.
This is, afterall, a site used by folks of all genders and all ages. Plus, if we got busted for pornographic content (adult content), then the forum's IP could either be filtered or blocked by other ISPs.
That wouldn't be cool.