There's a theory that suggests that having homosexuality is socially beneficial, because it means you have some non-rearing adults helping care for the children, similar to why humans live so far past the ages where they would normally be able to bear children, since they can still help socially raise the kids. It's been observed in birds, but there is a bit of disagreement over whether that's the case there, or whether there's some additional species-related complications at play.
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