Righteous Orbs tackles the reasons why male avatars tend to be less popular than female ones in WoW, and dissects the really obvious 'macho' fixation the devs at Blizzard have. For example, on the Blood Elf males model:
"Signs that your game might have unrealistic ideas about the human body #27, the characters who everybody says look too tiny and effeminate to carry a sword are built like f*cking Conan."
This is something I've noticed since the very beginning of the game (and really, does ANYONE think Human males look like anything other than dumpy goons?).