The evolution of same-sex sexual behaviour in mammals
by José M. Gómez, A. Gónzalez-Megías & M. Verdú
Published: 03 October 2023
"Same-sex sexual behaviour, that is, any attempted sexual activity between members of the same sex, has been reported in over 1500 animal species, including all main groups from invertebrates such as insects, spiders, echinoderms, and nematodes, to vertebrates such as fish, amphibians, reptiles, birds, and mammals. Same-sex sexual behaviour is particularly prevalent in nonhuman primates, where it has been observed in at least 51 species from lemurs to apes. This sexual behaviour is not limited to one sex or to the existence of artificial conditions, as it has been observed in males and females both in captivity and in wild conditions. Same-sex sexual behaviour is also frequent in humans, existing throughout most of our history and in many societies and cultures."
Full paper:
https://www.nature.com/articles/s41467-023-41290-x
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