Maybe the more difficult occur in areas where death in childbirth is normalized. Any birth canal works if you are ok with mom deaths. Plausible.
Sure you can just misogyny away the evolutionary downside of a woman dying in childbirth 
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There was no misogyny, just curiousity. Culture influences evolution, as much as environment, most likely. Culture determines mating habits.
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Death in childbirth is a massive negative in evolutionary terms (obviously)
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