Homosexuailty has shaddowed mankind from the very beginning. We tend to think that heterosexuality is natural (because of the inherent biological compatibility between the sexes), and that homosexuality is unnatural because it lacks a function in evolutionary terms. However, a historical examination of human sexuality, as well as an understanding of the interplay between instinct and intelligence lead to a conclusion that humans lost their sexual instinct in the course of evolution. Human sexuality is therefore 100% a function of individual experience. Childhood sexual exploration behaviors in the absence of any societal, familial, or cultural influences predispose a homosexual orientation development.