Hypothesis being here that men have less reproductive utility than women (due to limits imposed by gestation) and therefore may be a better “target” for population reduction in overpopulation scenarios.
The working pretense here is that overpopulation in general would lead to more homosexual individuals in a species (may or may not be true).
Disregard bisexuality for either group as sexual fluidity (possibly influenced by sex-specific brain dimorphism) is not what I’m trying to confound with here.
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So I think this falls into a trap of believing in “group selection” when it comes to evolutionary biology. Selection happens on individuals that either pass on their genes or don’t and traits that favour them are passed on. This happens even if those same genes are detrimental at a group level. For example evolution might still select for hungry rabbits even if they eat more than they need and destroy a biome and thus the whole group.
This theory of homosexuality borrows from the grandmother hypothesis of why menopause exists in humans (so that grandmothers help raise children) but (like a lot of evolutionary psychology) is an unverifiable theory so you can basically make up your own story about why something might favour an individuals genes and we’ll probably never know…
https://en.wikipedia.org/wiki/Group_selection
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