However, it also occurs in other species, such as Japanese macaques and capuchin monkeys. Among the primate order, homosexual behavior is most frequently observed in bonobos. In addition to well-known examples such as in mammals and birds, homosexual behaviors occur in reptiles, amphibians, fish, and invertebrates. Those that voice opposition to acceptance of homosexuality on religious grounds often consider homosexuality to be “unnatural.” However, homosexual behavior is widespread across the animal kingdom.

Over the past few decades, American society has increased its tolerance and acceptance of differing sexualities.