The prostrate is located between the penis and the bladder and in front of the rectum. It is about the size of a walnut or kiwi fruit. The urethra runs through the prostrate, connecting the bladder to the penis and enabling the flow of urine.
The prostrate also creates a fluid that nourishes and protects sperm during ejaculation. The fluid combines with the sperm to create semen. Prostrate muscles help propel semen out during ejaculation.
Prostrates normally weigh about 20 to 30 grams, but when inflamed they can weigh up to 100 grams. An inflamed prostrate should be examined by a doctor, since it often is a symptom of prostrate cancer or other problems.