I am male and play more female PCs than male PCs, but I mainly DM. I don't really understand how people could fear "unrealistic female PCs" - we are playing adventurers and other misfits, not the average people.
No one has any problem with playing a male PC that does not, as a lot of the peasants in D&D are apt to do, toils the soil, bows before the local knight, gets drunk whenever possible and has strong opinions about strangers. No one has any problem playing a male PC that is not hypercharged on testosterone, or thinks with his zipper, or conforms to any other stereotype, and no one has any problem playing a male PC that conforms to the male stereotype of the week either.
Only if you are playing a female PC it is suddenly possible to do it wrong? How on earth do you fail at playing your own PC? It is not as if there is an universally true and accepted standard of female behaviour that applies to any and all women, even to the crazy adventuring breed.
Heck, even if you play a slutty vamp, or a butch male-hating lesbian you are not doing anything wrong - you are just playing an extreme PC, like the pacifist priest, or the gung-ho fighter, or the lawful stupid paladin.
Only if your playing said PC in that way results in lessened enjoyment of the game for the rest of the group are you doing something wrong.