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chazwomaq t1_j520xuv wrote

Humans do show size dimorphism (about 15%), albeit not as much as some other primates, and certainly not as much as elephant seals. There is also substantial dimorphism in upper body musculature relative to lower body, suggesting adaptations for fighting.

The rest of what you described is Darwin's male-male competition and female choice.

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sheismagic4e t1_j525276 wrote

Thats a size difference in my eyes, due to a complex mating behavior humans developed over time and male physical aspects is one parameter that played/plays quite a significant role, which also indicates health.. likely the major aspects in mate selection on both sides. And could you please define what you refer to when using the term size dimorphism.

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chazwomaq t1_j5609v2 wrote

Size dimorphism means a difference in size between the two sexes of a species.

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