The penis is one of the external structures of the male reproductive system. The penis has three parts: The opening of the urethra, the tube that transports semen and urine, is at the tip of the glans penis. The body of the penis is cylindrical in shape and consists of three internal chambers. These chambers are made up of special, sponge-like erectile penis erection problems staminex.
This tissue contains thousands of large caverns penis erection problems staminex
fill with blood when the man is sexually aroused. As the penis fills with blood, it becomes rigid and erect, which allows for penetration during sexual intercourse.