The prostate is a walnut-shaped gland that is part of a man’s sex organs, which also include the penis, scrotum, and testicles. The prostate makes fluid that goes into semen, which is a mix of sperm and prostate fluid. Prostate fluid is important for a man’s ability to father children.
The prostate is in front of the rectum and just below the bladder. The gland surrounds the urethra at the neck of the bladder. The bladder neck is the area where the urethra joins the bladder. The urethra is the tube that carries urine from the bladder to the outside of the body. In men, the urethra also carries semen out through the penis during sexual climax, or ejaculation. The bladder and urethra are parts of the lower urinary tract.
Urine and semen flowing through the urethra pass through the prostate.