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Male Pacification is believed to be a precursor to the multi-generation family structure found in humans which is in turn believed to be a precursor for culture, our greatest strength as a species.
Also it's possible to "reproduce" without actually having offspring, if you, a gay man, help your sister raise 4 children to child-bearing age, and they in turn reproduce, you have, genetically speaking, had the effective spread of having two of your own children.
aggressive males killing their extended families children is, paradoxically, an inferior reproductive strategy
