I'm not equating nudity w/ 'bad art' or non-nudity w/ 'good art'; just to get that straight from the start.

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I'm not at all surprised that nude renders are popular.
Half? A Third? of the entire internet is nude and porn. Whatever the percentage, there are billions of nude and porn websites.
So the amount of nudes in an open art gallery such as Renderosity's seems to be in the general ballpark of the internet as a whole.

What is surprising to me is that there aren't enough people in an art community interested in serious artwork to make more of an impact in the ratings vs. the fan clubs.
If members here want the art galleries to be taken seriously by the 3d community in general, then they have to stand up and be counted; so to speak. If the members just ignore the cheap nude crap images and let the fan clubs decide which are the best images, then the gallery deserves to be treated as a joke.

A big drawback to this for me is that 'My Recent Views' is visible on my gallery page. So if I want to go and rate a garbage nudie pic as the garbage it is in my eyes; it ends up on MY gallery page. That's absurd to me. MY gallery should just what it says, Mine; my own work.
Then there is the fact that the act of rating an image as garbage, adds a view to it's counter, making it more likely that an image I think is terrible would make it onto the Most Viewed List.

Friends don't let friends use booleans.