The size of the penis cannot be changed by diet or medication, and in rare cases where the penis is too short it can be surgically enlarged. The size of the penis is related to congenital development, and the penis stops developing when the general population becomes sexually mature. Under normal circumstances, the satisfaction of sexual life depends mainly on the hardness of the penis after erection, while the thickness and length of the penis after erection do not affect the satisfaction of sexual life. After puberty, the thickness and length of the penis cannot be changed by diet or medication. If a small number of people are unable to maintain normal physiological activities of the penis, i.e., unable to have a normal sex life, they need to be treated by surgical procedures, such as penile enlargement.