I crop my thumbs to part of the image for just that reason ... I don't want to see a system generated content advisory thumb show up.

I rarely post nudes and, like JenX, I prefer to do a teaser thumb since that's what thumbnail images are for.  Frankly, I don't much care about how many views I get except in the product showcase where the thumbs are generally the same ones we use for the marketplace.

Hugz from Phoenix, USA

Victoria

Remember, sometimes the dragon wins. Correction: MOST times.