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If by unnatural, your friend means that "only humans do it", then your friend is dead wrong. For example, Bonobo chimpanzees would be very promiscuos by human standards -- sex is used for different reasons beyond reproduction for Bonobos. And, among things such as wild group orgies, homosexuality is one practice.
And Bonobos are not the only animal to practice homosexuality, but they certainly are a striking example.
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