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a man is sexually stimulated by sight, thought, or touch,
the brain sends signals that relax the smooth muscles around
the arteries that supply blood to the spongy and cavernous
bodies. The veins draining the bodies can't keep up, resulting
in swelling. As the swelling reaches the limit of the penile
skin, the penis becomes firm. The pressure of the spongy and
cavernous bodies against the skin partially closes the veins,
helping to maintain the erection. Erection continues until
the signals from the brain stop, but erections are not consistent;
waking and waning are normal, even during intercourse.
Erection can occur throughout life, happening before birth
and into the 90's in healthy men. Nocturnal erections occur
during all male dreams (regardless of what the dream is about),
unless the man has physical problems (this is the easiest
way to determine if impotence is physical or emotional in
nature). The so called "morning erection" is the
result of being wakened during, or just after a dream; and
it can be a very persistent erection. While a morning erection
is not a sign of arousal, its presence and the pleasurable
sensations it can create may result in arousal.
Men have only very limited control over their erections.
During puberty the young man is often embarrassed by erection
in public settings, but he gradually becomes able to suppress
erections when the stimulation is mild. Likewise, it is impossible
to "will" an erection, although sexual thoughts
can cause erection. During prolonged foreplay a man's erection
may go away; this is normal, and is not a sign of lessening
interest.
General health and physical exhaustion can affect erection;
when very tired, a man may be able to have only a partial
erection, but still be able to climax. Erection is lost in
two stages; the initial stage is very quick, but usually leaves
the penis firm enough to continue intercourse. The second
stage is somewhat slower and is effected by a variety of things
including age (which tends to speed it), and arousal level
before climax, with higher (or longer) pre-climax arousal
generally resulting in slower lose of erection
Although the head (or glands) of the penis is very sensitive
to touch, touch alone does not bring about an erection. The
epicentre responsible for such essential arousal is actually
within the brain. Only after the brain receives visual, audio
or mentally stimulating input will it transmit (via the central
nervous system) instructions to the smooth muscles along the
penis to relax. Specifically the release of nitric oxide in
the corpora cavernosa relaxes the smooth muscles. At the same
time, the artery to the penis widen to twice its diameter,
increasing the blood flow sixteen-fold, and the veins which
carry blood away from the penis are blocked. As a result,
the two spongy-tissue chambers in the shaft of the penis fill
with blood and the penis becomes firm. The corpora cavernosa,
acting like a sponge, fill with blood. In fact, the corpora
absorb up to eight times more blood than when the penis is
flaccid. As your penis swells and lengthens, the filled corpora
cavernosa press against the veins. The veins surrounding the
chambers are squeezed almost completely shut by this pressure.
The veins are unable to drain blood out of the penis and so
the penis stays rigid and erect. This condition normally keeps
this erection firm enough for intercourse.
At this most basic level this function is considered to be
normal if a man is able to maintain his erection sufficiently
long to engage in satisfying intercourse and the subsequent
ejaculation. The length of time a man might stay continuously
erect can be on the average be about 30 - 45 minutes. Of course
the duration of his erection vary greatly, in which case it
may be a shorter or a great deal longer. After ejaculation
or cessation of further stimulation to the penis itself or
to the brain excess blood will be allowed to drain away, while
the level of blood flow into the penis returns to normal.
The penis once again becomes flaccid as it loses the built
up pressure.
Erectile quality or intensity may depend on the kind of stimulation
the brain receives. Acts as simple as kissing or "petting"
are at times sufficiently arousing to bring about an erection.
Viewing a sexually titillating movie or photographs will arouse
most men to erection. Beyond this the particular nature of
erotic images will have varying effects, as men tend to have
a broad range of sexual tastes and desires. While some men
may become highly aroused by simple stimulation, others thrive
on fetishes.
The male libido reacts to a wide variety of stimulation.
To consider a man sexually dysfunctional solely by measuring
his arousal during intercourse, with a long term partner,
is simply too limited as well as illogical. Certainly there
are men who are not only fulfilled, but thrive in life-long
monogamous relationships. There is really no size fits all
when it comes to men’s sensibilities and needs. It would
be a mistake however to insist that all men can achieve the
same purpose, blissfully maintaining a long-term relationship,
which is both sexually and emotionally satisfying.
What if things aren't quite working that way? There are a
number of conditions which may diminish or otherwise influence
this process, these are known and considered less than one
very general catch all term: Erectile Dysfunction, which is
technically defined as "the inability to achieve or maintain
an erection sufficient for sexual intercourse". This
is one of the most common sexual ailments in men. Although
erectile dysfunction can be primarily psychological in origin,
for most men it's more likely a physical disorder, often with
some psychological overlay. While some men assume that erectile
failure is a natural part of the aging process and tolerate
it; others find it devastating. Withdrawal from sexual intimacy
because of fear of failure can damage relationships and have
a profound effect on the overall well being of the couple.
The Massachusetts Male Aging Study measured several health
related variables in 1290 men aged 40 to 70 years. Erectile
dysfunction was very common. Fifty two per cent of the men
reported some degree of impotence-mild in 17.1%, moderate
in 25.2%, and complete in 9.6%. Complete impotence was reported
by 5% of men at 40 years of age and 15% at 70 years of age.
Over the past decades, the medical perspective on the causes
of impotence has shifted. It was easy to routinely attribute
almost all cases of impotence to psychological factors. Now
investigators estimate that between 70% and 80% of impotence
cases are caused by medical problems. It is often difficult
to determine if the cause of erectile dysfunction is physical
or psychological, or even some combination. The following
may be helpful in understanding the difference.
1) Psychological impotence tends to be abrupt and related
to a recent situation. The individual may be able to have
an erection in some circumstances but not in others. The inability
to experience or maintain an erection upon waking up in the
morning suggests that the problem is physical rather than
psychological.
2) Physical impotence occurs gradually but continuously over
a period of time. If impotence persists over a three-month
period and is not due to a stressful event, drug use, alcohol,
or medical conditions, the individual may needs to seek medical
attention from a urologist specializing in impotence.
In virtually every case of impotence, there are emotional
issues that can seriously affect the man's self-esteem and
relationships, and may even cause or perpetuate erectile dysfunction.
Many men tend to fault themselves for their impotence even
if it is clearly caused by physical problems over which they
have little control.
Anxiety has both emotional and physical effects that can
affect erectile function. It is among the most frequently
cited contributors to psychological impotence. Anxiety over
sexual performance is often referred to as performance anxiety
and may provoke an intense fear of failure and self-doubt.
It can sometimes set off a cycle of chronic impotence. In
response to anxiety, the brain releases chemicals known as
neurotransmitters that constrict the smooth muscles of the
penis and its arteries. This constriction reduces the blood
flow into and increases the blood flow out of the penis. Simple
stress may even promote the release of brain chemicals that
negatively affect potency in a similar way.
Depression is strongly associated with erectile dysfunction.
In one study, 82% of men who reported moderate to severe erectile
dysfunction also had symptoms of depression. Depression can
certainly reduce sexual desire, but it is often not clear
which condition came first.
Problems in Relationships often have a direct impact on sexual
functioning. A lack of communication among the partners can
lead to partners of men with erectile dysfunction feeling
rejected and resentful. Both partners commonly experience
guilt for what they each perceive as a personal failure. Tension
and anger frequently arise between people who are unable to
discuss sexual or emotional issues with each other. Such a
situation makes it very difficult for the man to perform well.
Socioeconomic Issues like losing a job or having lower income
or education increases the risk for impotence.
Smoking (particularly heavy) is frequently cited as a contributory
factor in the development of impotence.
Alcohol has also been implicated in causing impotence. In
small doses, alcohol releases inhibitions, but in doses larger
than one drink, it can depress the central nervous system
and impair sexual function.
Lack of Frequent Erections deprive the penis of oxygen-rich
blood. Without daily erections, collagen production increases
and eventually may form a tough tissue that interferes with
blood flow. The spontaneous erection men experience while
sleeping or awake may be a natural protection against this
process.
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