Well, i played female paladin, female ranger/cleric in BG I. The matters are simple, the portraits. I do not like much male portraits offered, i can rarely find one what suits me
I like the picture with some thought and some story. I have found one for bard, for example, and lately more or less universal male, though the last works rather in connection with the background ("The Highlander").
They let me play males in BG II, mostly because romances. There is some fun in guessing right way, after all
The lone romance for she-hero is rather not my cup of tea. Not sure i wouldn't try, though, if i'd find motivation enough. I'm thinking about female cleric (without romance this time, something about Anomen makes me positively sick, appears i'm not either sane and insane enough, may i be forgiven
) Though i may change my mind either way, i do it pretty often