Overview
The period of emission and ejaculation is called the male orgasm. Males are able to reach orgasm from the time they begin puberty. During puberty, many males even reach orgasm during their sleep. This is called a "wet dream."
Penile erection involves a complex interaction between three systems of the body: the vascular system, the nervous system and the endocrine system.
Nervous System
With increasing intensity of the sexual stimulus, the reflex centers of the spinal cord begin to emit impulses that leave the cord, go to the genitals and initiate emission, the forerunner of ejaculation.
Vascular System
Fluid from the vas deferens, the prostate, the ampulla and the seminal vesicles (and even more tiny glands), are propelled into the internal urethra by contractions of the groin muscles. The filling of the internal urethra elicits signals that are transmitted through the pudendal nerves from the spinal cord.
Increases in pressure in the urethra cause the semen to be propelled to the exterior, resulting in ejaculation. After ejaculation, erection ceases within one or two minutes in most males.
Endocrine System:
It is apparent that sexual desire and performance depend on some threshold level of testosterone. However, this level varies from man to man.
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