The prostate is a small gland the size of a walnut which is only found in males.
It consists of small glands and tubules, muscle fibres and connective tissue.

The prostate sits around the urethra (the tube that transports urine from the bladder to the outside of the body via the penis.) It is situated just below the bladder. Because of its position it is able to block the outflow of urine from the bladder if it enlarges.

The prostate is a gland and produces fluid which forms part of the seminal fluid. The seminal fluid is the fluid in which the sperm swim. When a man has an orgasm, the fluid ejaculated contains sperm (from the testes), prostatic fluid (from the prostate) and fluid from the seminal vesicles. The prostatic fluid nourishes the sperm.
Adapted From: Know your manhood. Lissoos I. KYB Pocket Books 1984.
Used with permission from the publisher.