I still haven't had a sensible answer to this question:

If I tick "No Nudity". I would not expect to see any picture, thumbnail or otherwise, that contained nudity.

If I don't tick "No nudity", why would I be offended by a nude thumbnail?

Seems an easy thing to do but this site has made a dogs breakfast of it.

Seems there are folks out there who don't like looking at a nude thumbnail but like to look at the full monty in hi-res. Why try to cope with perverse people?