My D&D group is rather big (7 people at one point, but the whole group can't always make it to sessions, so size isn't a problem), and very odd. Before one of our guys moved away, we had two guys and *five* girls. And since our only remaining guy is the DM, our party is entirely female.
The only two of us who have a high charisma the sorcerer and the druid.
I play a ranger currently, so my high stats are str, dex, and wis. Our rougue/wizard's high stats are dex and int. And so on. We put our high stats in the appropriate places, as any smart roleplayer, male or female would. Charisma is the "dumping stat" for most of us, since only the sorcerer really needs it, and our druid's high cha fits with her character. Since I don't like spellcasting classes much, the only character I've ever given a high charisma to was my brownie paladin, who I made male.
The idea that all female gamers boost their charisma is a combination of, 1) a stereotype concieved by guy gamers who don't encounter many female gamers, and, 2) women who do it either out of inexperience, or deliberately for character personality.
High scores generally go where they're needed for the character, male player or female player.
(( Sorry for my big first post. . ))