Why?
In: Biology
Not sure if you mean biologically or in terms of evolution? In any case, men have much, much higher testosterone which drives hypertrophy (muscle mass accumulation) among other biological factors. Evolution-wise, having more muscle is a disadvantage, all things being equal, as it needs a lot of energy to maintain. This suggests human females did not need that extra mass whereas human males did, so there were clearly a divergence of mass need in gender roles. For females, saving that extra energy means more success for offsprings, just like walking on two legs saves energy, same goes for cooking food instead of eating raw. Men have more mass likely because of the needs of hunting, endurance, etc. Mind you, the differences between human genders is not as stark as in other species where the differences can be massive, and in some cases reversed (female incredibly bigger and stronger than males). It all has to do with evolution and which characteristics were needed for more successful reproduction.
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