The difference between the pubic bone in men and women is mainly reflected in the inferior pubic angle, which is the angle at which the inferior pubic branches meet bilaterally. In men, the angle here tends to be around 90°, which is relatively narrow, while in women it may be around 120°, which is relatively wider. The main reason for this difference between men and women is that the female pelvis needs to be used as a bony channel for birth, because during birth the fetal head needs to pass through the pelvic outlet in order to be delivered through the birth canal, so the lower part of the pelvis needs to become wider. In addition, the female pelvis will become more rounded at the back, and through this series of changes, the pelvic outlet will become larger. Men do not need to give birth, so at this time will make the corresponding angle and width to reduce, in order to increase the stability of the pelvis, because the angle is properly reduced can make the hip joint, as well as the pelvis become more stable.