Sexual dimorphism evolves a lot slower than monomorphic traits—for this story to work, you need to posit both a counterbalancing selection pressure making cooperativeness maladaptive in women, and much more time than 10K years http://www.gnxp.com/MT2/archives/003689.html …
Cooperation for men involves actually cooperating to achieve a task since accomplishing tasks is actually important to disposable men. For women, "cooperation" means no one gets angry enough to cause a social fracture - they ruthlessly enforce "everyone be nice" 4/x
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Men being selected for "ability to cooperate" doesn't result in the same effects in women. The pre-existing split gets intensified b/c any mal-adaptive changes these genes are introducing into women's social behavior aren't getting weeded out. 5/x
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Using the same word "cooperative" for both sexes is misleading. Men are selected for cooperation - defined as the ability to form a working group that can perform a task. Women being "cooperative" looks like an entirely different thing. 6/6
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