Its hard to come to any essentialist conclusions about muscle strength in the sexes, given the social factors at hand. Both sexes have the biological ability to gain muscle, although statistically men have more upper body muscle mass, or muscle mass in general. But this may because men are more prone to athleticism. Up until 150 or so years ago, women hardly played sports or ran races. Now, women have beat men in some of the longest distance races in the world.
Testosterone does promote muscle growth and bodybuilders traditionally have embraced it and feared estrogen as a weakening hormone. But in reality, estrogen promotes muscle growth if used in balance with testosterone. Female bodybuilders seemingly get as big as male bodybuilders. Its evident that there is significant variation among individuals and that hormone production is not fully understood.
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