It is obvious why many women are figure-eight.

The pelvic structure of women is wider than that of men, which is convenient for pregnancy and placement of the fetus.

In the past, there was a saying that "the buttocks are fertile", which means that after a woman with a wide pelvis is pregnant, the fetus can keep a healthy delivery.

The wider pelvic structure increases the hip joint spacing, so women will divide their toes into eight figures.