jekyl_hyde

I tend to agree with numinous' explanation of starting out male and female.

and to those who talked about the homosexuality in the societies of Rome and Sparta, don't forget, at the highest peak of sexual activity for both societies (orgies, homosexuality, and whatnot), both societies fell.

as a matter of fact, going back and looking at just about all the great societies ie. Egypt and Japan, once the sexual activities for both reached it's climax (nice pun here), many historians argue that that is when these started to deteriorate. After all, scientific research shows that the average person needs some recovery time after a good romp (horomones, ie. testosterone).