I don't have any scientific data to back this up and I can't really conceive of how to put together a research program to prove, or disprove it, but ...
... I have long suspected that equilibrium has been achieved between the sexes where one sex is able to manipulate and control the other psychologically, but lacks the drive and ruthless ambition to take total control.
I also suspect that if women had the evolutionary drive to conquer and subdue, they would have long ago subjugated men to a much lower class segment of society, such as beasts of burden or indentured stud farms.
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