Throwing in my two coppers.
For every male character I play, I play two females. (I'm male, obviously.) The reason I play women? They're the underdog. Just as I might play a (male) halfling barbarian who would yell, "Your knees are MIIIIINE!", the female elf templar would be pretty interesting. I mean, who plays halflings (except for roguish comic relief) or female non-wizard elves? They end up pretty unique characters in my mind (and that elf chick, well...)
And who (besides powergamers) doesn't like playing the underdog, especially in a role-playing world?
Fantasy IS sexist, end of story. But whether men or women may get the shaft is anyone's guess. You have the misogyny of Robert E. Howard's Conan and John Norman (who's that guy again?)'s Gor; you also have the femininism of Anne McCaffery and Marion Zimmer Bradley. And there are far, far more examples than those.
(Of course, women, most notably MZB, who write about other women often toss 'em in an uber-patriarchal society, attempting to make us like them more. Bleh! Then again, men can make ridiculously strong women, so the balance persists.)
And who is that cheesehead who prohibits allowing men playing women (and possibly, women playing women) in his roleplaying world, because females gain advantages!? They are at a disadvantage in 95% of their worlds. You might think of women using their attractiveness into getting what they want, but they can only go so far (no bluffing that you are the captain of the guard), and in patriarchal societies, that would turn out as a disadvantage, as a woman's attractiveness would only lead to arranged marriage, harrasment, or even worse...
Note that I did not say "charisma". Attractiveness and charisma are completely unrelated.
Also, gender-related bonuses are always conditional. In a patriarchal society, a charismatic woman might seduce a strong, tough man and steal the invasion plans, but she would NEVER be able to convince the local uber-lawful guard that she is the emissary/vizier/captain/etc. Here is proof that she gets a penalty to her Charisma check! Conversely, the 70-year-old ugly-looking (yet charismatic!) sorcerer would get slaughtered by the big dude ("Hey, foo', I can kick your arse!" "Yeah, right!"), but might be able to get past the guards the woman would not be able to pass. Bonus to charisma!
From this, the net gain for the overall de facto enhancement bonus to Charisma for the man and woman stand at a zero, and with both situations about equally likely, biases notwithstanding, the overall factor still remains at zero.
(Edit)
And Fenes 2: I definitely agree with you. BTW, based on the fact that women use attractiveness and lack real-life leaders, is it safe to say that women should actually be LESS charismatic than men?