The prostate, also known as the prostate gland, is a gland weighing approximately 28 grams and sits below the bladder. The urethra runs through the middle of the prostate and continues into the penis. The back of the prostate borders the rectum.
The prostate is solely responsible for reproduction. It produces a secretion that, together with the sperm produced by the testicles, forms the actual sperm. The muscle fibers of the prostate ensure that the sperm is ejected from the urethra during ejaculation.
The prostate secretion is milky, cloudy and slightly acidic (pH 6.4). It is responsible for the functionality and motility of sperm.
Source: Prof. Dr. med. Dietmar Molitor, Urologist