If you sometime wonder why, read this too:
The Evolutionary Advantage of Homosexuality
Looking at our evolutionary history, viewing sexuality as a social act and recognizing its fluidity and spectrum gives a perspective that helps to explain homosexuality as natural. This also gives a different perspective on female sexuality, polygamy, promiscuity and the variety of sexual practices in the world. The reason gay and other non-reproductive sex would likely exist is because sex evolved into a social act. As a social act, sex would have been advantageous during our development as a species, and gender would not matter.
Homosexuality is too common and universal to be an unnatural phenomenon. By some estimates, it exists in about 10% of the human population and has been considered normal and expected of people in many societies throughout history—Ancient Greece and Feudal Japan for instance. Homosexuality is also very common in animals, who are indifferent to their own sexuality and the sexuality…
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