heyas; you're thinking of 3d commune; THEY have the rule about no nudity in thumbnails. when you check the nudity option at upload of a gallery image, it is not visibly marked or tagged in any way. however, for people who have, in their member options, chosen to block nude images, those gallery images do not appear at all. that is what the nudity tag on the gallery does, it 'hides' those images for those who choose not to see them. it is not an advertisement. now, on the forums, i believe, all messages show up to everybody, even those who have opted not to view nude gallery images. the threads need to be properly marked and people have to consciously avoid those.