As a writer of yaoi, I somewhat agree. The uke always seems to have a either a feminine appeal or is overly youthful. I see this a lot in the Yugioh yaoi section as well.
To be honest, I have a hard time seeing a Sasuke/Naruto pairing simply because Sasuke always seems so closed off. Albeit, I am new to the fandom and am learning the characters as I collect the manga.
Although, I have to somewhat disagree on the pervy level of Naruto. Think about it, his version of henge jutsu - sexy no jutsu - what 11/12 year old thinks of that?!
lol