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The
period of emission and ejaculation is called the male
orgasm. Penile
erection involves a complex interaction between three
systems of the body: the vascular system, the nervous
system, and the endocrine system.
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Erection
Although much research has been done on erectile function,
and dysfunction issues, many aspects of function still remain unclear. (Even with
the invention of those blue pills you've seen advertised
on TV.)
Erection
results from dilation of the arteries in the penis and an
increase in arterial blood under high pressure -- to simplify
things a bit. This causes the erectile tissue in the penis
to become engorged. Erection also most likely involves several
neurotransmitters.
Orgasm
 With
increasing intensity of the sexual stimulus, the reflex centers
of the spinal cord begin to emit impulses that leave the cord
to the genitals and initiate emission, which is the forerunner
of ejaculation. 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! The period of emission and ejaculation is
termed male orgasm. After ejaculation erection ceases within
1 to 2 minutes in most males.
Hormonal
Role?
It is
apparent that sexual desire and performance depend on some
threshold level of testosterone, however, this level varies
from man to man. One of the greatest inhibitors of sexual
functioning in males is loss of or low self-esteem and the
development of a negative self-image.
Bulbocavernous
muscles & ischiocavernous muscles. (for those that want
to know). Bulbocavernous muscles are at the very base of the
penis, the others are deeper in the groin around the penis.
Learn about the Female Orgasm
For more on the phases of an orgasm,
go to that page...
For more on penis questions, see the Sex
FAQ pages or 'Penis Problems'
or "Penis Size Answered"
and Penis
Questions. These were requested articles from readers.
See the Male Health Forum, for
more guy related health and sexuality topics.
Worth Reading:
The
Penis Book - An Owner's Manual for Use, Maintenance, and
Repair
Designed to help men understand more about sex, and
to provide practical information about the make body --
how it works and what to do if things go wrong. The book
will help to allay common fears, correct misconceptions,
and lead to a more physically and emotionally satisfying
life. B & W line drawings throughout.
What Your Mother Never Told You about Sex! -
by Dr. Hutchinson
To Sex Stuff for sexual health information and education...
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