Why am I not really attracted to black women?

I'm a white guy and I'm not racist or anything; the color of a person's skin is about as important to me as the color of a person's eyes. But for some reason there have only been a handful of black girls I've been attracted to. Even the hot black girls that everyone else is attracted to, I'm not for some reason. Why is this? Does it have something to do with genealogy or something like that?