The role of the penis is to urinate, discharge semen, complete sexual life, etc. The penis is the external genital organ of the male, consisting of the corpus cavernosum of the penis and the corpus spongiosum of the urethra, which is the common outlet for semen and urine. 1. Urination: urine is excreted from the bladder and then out of the body through the urethra. The excretion of metabolites in urine is beneficial to health. 2. Excretion of semen: when sexual life reaches orgasm, semen is discharged through the urethra to complete the ejaculation process, so semen enters the female vagina and combines with the egg to form a fertilized egg. 3. Completing the role of sex life: the penis can solve the physiological needs of couples, experience the fun of sex life, enhance the relationship between couples, and promote the normal secretion of hormones. When the penis is not suitable, it is recommended to go to the hospital, under the guidance of the doctor to actively treat, do not be negligent, so as not to delay the condition.