This is something I think about from time to time. When you get down to it, all personality is really unisex. I realized that many of my characters base personalities can be applied to the opposite sex and [i]still[/i] work. But, even then, you'd also have to consider that males and females are exposed to different things, and have different standards to live up to given their culture - but, again every person has different experiences... and I should probably stop myself there before I start rambling.

I tend to play whatever character I get inspired to play - which tends to be more girls, but I've been trying to break that habit lately. But, I also think that even gender ratios are only good depending on the setting. Probably a big manly WW2 RP would make more sense to be comprised only of dudes than be only made of girls (Unless it's a weird anime-styled AU lol). It'd probably make sense for slice of life RPs to have a balanced (or remotely balanced) cast than anything tbh.