This rule seems fair. It's not even for the under age users specifically, as some people (like myself) wouldn't want to see images like that. There's no need to have to post it here, if you want to share something with someone then do it privately knowing you can't insult or upset anyone else.

Plus, nudity images just sort of degrades the whole forum if we relaxed the rule, really. And we'll just be inviting people to share, essentially, porn.