I personally don't think you can say its OK to have naked aiko anime or fairy images even if people don't see them as children if they look young. but I think that goes for any image using any figure. 
I don't do naked women images so it doesn't really affect me personally but I do think that the rules have to be more clearly defined. Just what is acceptable and what is not.
Personally I don't think an image should be acceptable in the Market Place but not in a gallery here. That's a double standard and it strikes me as wrong. Some day someone is going to say "But I used the exact morph and the exact pose that was in the Market Place (with a different background maybe) so why can't I post it here?"