You are from the human race :D. Everything skin deep are little alterations through evolution that humans had needed to help them adapt to their environment. Like light skinned individuals lost their darker coloring because when they moved out of Africa towards central asia they needed to get rid of the darker skin to get as much sun rays into their bodies for those precious vitamins since they weren't living in a tropical environment any longer(Africa back then was not always a desert). Dark skin acts like a natural sunblock basically.
What's interesting is that central asia people today look exactly like a mix between asian and european. That's because those people in the past either went more east and developed more asian features and the people in the west started developing more caucasian features. I'm no geneticist but it's a pretty interesting field

.
That was kind of a long rant, sorry about that but I was getting to the point that I don't think sexuality and skin color are great analogies, you could use better

, but I know what you are getting at.
Oh another interesting tidbit, our species has spent 3/4 of our lifetime in Africa, we started venturing out pretty recently.
Very interesting stuff.
Another interesting fact? Literally every single human population on the planet that is isolated from sexually transmitted disease (i.e. native islanders) has a near 100% prevalence of homosexual behavior among the men, and 60-80% among women.
That is to say, basically, that everyone is fucking everyone. The men are having sex with the women AND the other men, and the women with the women, too.
The theory behind why this happens is that sexual orientation is genetically based, and that those with genes that predispose them towards homosexual behavior (not pure homosexuality, but simply as an ADDITION to heterosexual behavior) are more likely to have more partners, more experience, and to do so at an earlier age, therefore becoming better lovers and be more reproductively prolific (have more kids). As a result, the "gay behavior" genes will "push out" the "straight only" behavior genes because those who are 100% straight don't have as many kids. The result of this interesting phenomenon is populations like native islanders who all just have sex with everyone.
However, when STD's are introduced into the picture, those with the pro-homosexual behavior gene are also more likely to acquire an STD and die earlier or become sterile, eliminating their reproductive advantage and "stabilizing" the "gay gene" at a lower level in the population since it is neither advantageous nor disadvantageous reproductively.
This is, of course, a gross oversimplification, and the presumption of those involved in promoting this theory is that numerous genes are involved, creating a "spectrum" of totally heterosexual to totally homosexual behavior, hence why some are totally heterosexual and some are totally homosexual.
Even MORE interesting, it's theorized that those who are straight reject and shun homosexual behavior because of the unconscious, genetic understanding that those who engage in homosexual behavior are a grave threat to their reproductive success and have a high chance of stealing their women (or men) as well as spreading disease, while this isn't the case in indigenous populations where everyone, is well, doing everyone, so there's no threat.
So, if we can knock out STDs, in a few thousand years, dudes will be plowing one another in the ass before going home to their wives who were scissoring the shit out of their best friends only hours before.
Enjoy that visual, folks!
