My images always get higher rating if they contain nudity, and I must admit that sometimes I am swayed by that fact(although I do like to render nudes). Sometimes I'll spend weeks on an image that doesn't contain any nudity but is complex (for me, anyways) and, in the end doesn't really receive much attention. Then, I'll just slap something together in a couple of minutes (with obvious nudity) and render it, and get all sorts of comments and approval. So, sometimes when I need some feedback, I'll slap something together quickly and render! :)