I've only played through SoA 3 times, and only played through ToB 1.9 times (about to finish it the second time), and I just noticed that all three characters I've played (a Mage, a Kensai/Mage, and a Monk) have in fact been male...and my next idea for a character (a Cavalier) is male too.
Not entirely sure why this is...I am in fact male, but I've certainly never had trouble playing female characters in *other* games...I think I've only done it when the choice was forced, though (I've played Valkyries in NetHack, which are always female, and plenty of text adventures with female protagonists, and a not-great but fairly decent graphic adventure called...er...the name escapes me; it was set in two worlds, one fantastic, one sci-fi-ish...anyway, it had a female protagonist too). None of these protagonists bugged me, or even got in the way of my immersion, but I do somehow always seem to choose male protagonists when I have the choice.