"A new study has found that 59 nonhuman primate species have been seen to take part in same-sex activities. The report, published in the journal Nature Ecology & Evolution, is the most comprehensive review into the same-sex behaviour of primates ever. It includes analysis on species including chimpanzees and macaques. It is suggested that the same-sex behaviour developed through evolution, to allow the primates to reduce conflict and build bonds in complex social groups."
"Activity between male-male and female-female primates was documented. It found that the behaviour was most common when the animals needed to deal with difficult environmental conditions, though was also documented in groups with strict hierarchies in which it could build alliances and avoid aggression within the group. Savolainen said that same-sex behaviour is like a "currency" for some primates, used to increase opportunities and share resources."
Same-sex sexual activity has been observed in 59 nonhuman primate species, including chimpanzees and macaques. The behaviour appears to have evolved to reduce conflict and strengthen bonds within complex social groups. Both male–male and female–female interactions were documented. The behaviour is most common under difficult environmental conditions and in groups with strict hierarchies, where it can build alliances and avoid aggression. In some primate groups the behaviour functions as a social "currency" to increase opportunities and share resources. Same-sex behaviours are also found in other animals, illustrated by long-term penguin pairings and parenting.
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