There's more to people than that. Between each individual, a person might be crazy, fat, ugly, the wrong race, skinny, a smoker, etc. But among just about every normal human/mammal/complex life form heterosexuality is the standard that they were evolved to partner for reproductive reasons and their physiology indicates this. While some individuals might ACT in homosexual manner, there are MANY aberrant sexual behaviors evident throughout the animal kingdom. But male and female pretty much is standard even down to plants. To pretend that homosexuality is just some kind of "variation" is just rationalistic bullshit.