Why is the sperm located outside of the male's body within the scrotum rather than somewhere within the body? Pg. 456
Sperm cannot live at body temperature; instead, they prefer the cooler temperature of the scrotum. To avoid infertility, a surgeon will take care of the patient's cryptorchidism by pulling the undescended testicles into the scrotum. When the surrounding environment gets cold, the scrotum/penis shrink because the sperm also can't live in amazingly cold weather.