The penis is a male external genital organ of the human body, mainly located in the male perineum, the Department of the two thighs at the junction of the root of the inner side of the pubic bone joint in front of the lower part, with urination, sexual intercourse and other roles. The penis is an external genital organ of the human body, and is a unique male sex organ. The penis can be divided into three parts, namely, the penis root, penis body, penis head, located in the lower part of the front of the pubic symphysis, which is mainly composed of a urethral spongiosum as well as two penile spongiosum, the outside of the penis is wrapped by the skin and fascia. The main functions of the penis are urination, sexual intercourse and ejaculation. In conclusion, the penis should be protected from trauma. If you feel any abnormality in your penis, you should go to the hospital in time.