Most likely connected to personalities which are often concerned with certain values according to how their culture define them. In both cases females and a black person, as you put it, have certain stereotypes about them connected to the image of being a tough guy or the fact that most girls are quite feminine (shock-horror). Generally though people don't always pick their class based on this, especially not men. Females might and therefore go a little more for aestethics of elves, etc. But that is impossible to verify as anything more than sheer happenstance.