An area of the body, that when stimulated with hands, mouth or other means , gives sexual pleasure. The External sex organs. The external sex organ that carries the sperm-semen mixture in the urethra. It is composed of muscles and blood vessels. When the blood vessels become engorged and the muscles become taut in the erectile tissue of the penis, it becomes erect.
Erection is necessary to carry the ejaculate containing the sperm into the vagina.
Stimulation by hand or mouth can enhance sexual pleasure. One of these hormones signal the testes to produce testosterone at puberty. The other signals the testes to produce sperm. A healthy man can produce about 1000 sperm per minute in the seminiferous tubules. It is a male accessory sex gland which adds more semen to the ejaculate.