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In humans, females generally have more rounded
and voluptuous buttocks than men.
This is caused by estrogen that encourages the body
to store fat in the buttocks, hips and thighs.
Testosterone [predominately in men]
discourages fat storage in these areas.
Evolutionary psychologists suggest that rounded buttocks
may have evolved to be a desirable trait because they provide
a visual indication of the woman’s youth and fertility.