The buttocks in human females thus contain more adipose tissue than in males, especially after puberty. Testosterone discourages fat storage in these areas. In humans, females generally have more round and voluptuous buttocks, caused by estrogen that encourages the body to store fat in the buttocks, hips, and thighs. Some anthropologists and sociobiologists believe that breast fetishism derives from the breasts' similarity to buttocks, but instead provide sexual attraction when the body is seen from the front.
Sexologist Alfred Kinsey has suggested that the buttocks are the primary sexual presentation site in primates.
