The normal proportion is much closer to 0 for a number of reasons, not the least of which being such things being understandably banned in a number of countries.

If it was formally regulated by a government body, sure, but given how much cartoon/anime/manga has characters that trend lower, I would assume that Deviantart has more than 1% of questionable/obscene content like that--Deviantart's the biggest art site I know, that's the baseline I was using

The way sexualized Evangelion stuff gets posted even though the characters are 13, for example, is baffling, but it just... gets posted nonetheless