
I play primarily female characters with a few male 'utility' characters -- like bank alts, start-up-on-a-new-server-death-knights, or the paladin that I know I will be abandoning at level 12 -- thrown in. But almost all of my (tens of) hunters are female.
Like others have mentioned already, I tend to play on RP realms and I find it easier to get into character with a female .. err .. character. And I also find that the overly-muscled male look of a lot of races really grates on me (and is annoying to see around to boot).
I'm not terribly fond of male trolls because of their bad posture, but I do adore male blood elves (sexy!) and I don't mind male undead (they just aren't as cool as female undead). On the Alliance side, male humans are acceptable and male night elves as okay only because they are an alternative to the annoyingly bouncy females.