Id say its far closer to false advertising when an image has no nudity tag, the thumbnail has no nudity (not that it should), and then you find unexpected nudity when you click to see the full sized pic. THAT is why nudity and violence tags exist, to advertise imminent nudity or violence. Then what if youve innocently clicked a link that has no warning tag, turn around, and the Pope happens to be standing there wondering why there are gazongas on your monitor? What do you say to him?

No one that I can see, doing a look back over this thread, has complained about nudity IN the gallery. The thumbnail preview section IS NOT the gallery, its the preceeding page, on which people can see the word nudity to warn them that if they actually enter the gallery from this preview link, they are going to see nudity of some kind.

Putting a thumbnail picture of nudity immediately below the word "nudity" - when that tag is specifically meant to be a warning and protection - is a defeat of the whole purpose of the tag.