Not Safe For Anyone. Not only are all NSFA things considered NSFW, but you would look at these things at home, with the curtains closed, and no one watching you. Borderline disgusting to most reasonable people. Known to corrupt small children.
Bob: hey, want to see my image folder on the server?
Steve: k, sure
Steve: *checks and sees it's full of guro*
Steve: good god, nsfa tag, maybe!?