Why is it, exactly, that making an NSFW post in the Off-Topic Forum is bannable? It is the place for "everything else," after all. Perhaps you could have people mark their posts with an NSFW tag, and if it's not marked, you are banned. You cannot view these posts unless you sign in.
Thoughts?
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*feature goes into effect* 5 minutes later... "Hey guys, watch this adult video and tell me what you think of it." "What do you think of this guys dick?" "Post dick pics!" So, uh, no. ©