1. Orgasm
2. Ejaculation
3. End of Erection

MALE ORGASM

On getting sexual stimulus, a male gets Erection (hard on, stiffness, increase in length and girth of penis, Tumescence) due to the action of parasympathetic nervous system.

What does sympathetic nervous system do to bring about ORGASM?
Actions of the sympathetic response that are necessary to reach orgasm after sexual arousal are:

1. Increased heart-rate: TACHYCARDIA
   From the normal 80 – 100/minute the heart beat increases to 180 per minute or more.
   (In an athlete/sportsman/a person who does heavy aerobic exercise the heart beats are any where from 60 to 80 per minute in resting state. This signifies that the heart muscle is powerful enough to deliver the blood necessary to the body with lesser heart beats.)
2. Increased systolic blood pressure:
   From the normal of 4-100 mm Hg
3. Increased respiration: HYPERVENTILATION is a constant accompaniment with respiratory rates as high as 40 breaths per minute

This means the guy has to do vigorous physical activity to get an ORGASM * * * * *

* * * * * An interesting medical fact derived from this is:
SEX is good physical exercise. So if you do not want to wake up in the morning and go for jogging or to the gym DO SEX (sexercise). You can now exercise in bed and enjoy orgasm too. Sex burns calories and keeps person physically and emotionally fit.

Ejaculation

Sexual intercourse both culminates and terminates in orgasm, a process in which the male expels semen, containing sperm cells and a seminal plasma that contains water, salts, cell nutrients and metabolites.

At the orgasm the penis contracts rhythmically to expel the sperm and semen, a process called ejaculation.

The male’s ability to produce and secrete semen, as well as to function sexually, is dependent on the androgen hormones, which circulate in the male’s body.

As the ejaculation and then orgasm is essential for fertilization, and since the male responses are usually more rapidly induced, the male probably achieves orgasms more consistently during intercourse than does the female.

1) it involves contractions of the entire genital tract – from epididymis through seminal ducts to seminal vesicles. Fluid from the prostate gland is pumped into the upper urethra, where it is joined by fluid from the seminal ducts and seminal vesicles. During the orgasmic phase prostatic fluid repeatedly is added to the seminal fluid content by regularly recurring contractions of the prostate gland. As the ejaculatory process begins, the sphincter (muscle ring) at the bladder opening closes, preventing seminal fluid from being forced back into the bladder and also preventing urine from being forced into the seminal fluid.

2) The second stage of ejaculation begins with a relaxation of the urethral sphincter at the base of the prostate, allowing the seminal fluid to flow into the distended urethral bulb and penile urethra.

Contractions of muscles in the perineum (the region between testicles and anus) and the penis propel the fluid along the penile urethra.

The first third of the seminal fluid expelled contains about 75 percent of all sperm in the ejaculation. The later part of the emission consists largely of fluids from the seminal vesicles and prostate gland.

The male is ordinarily unable to experience a second orgasm except after a waiting period.

End of Erection
Noradrenaline released by sympathetic fibers contracts penile smooth muscle fibers. Noradrenaline seems to play a major role in the termination of erection, because the contraction of these smooth muscle fibers allows the blood that has filled the corpora to leave the penis.

Stress, -> Sympathetic Nervous System -> Diseases

The body responds to stress through the Sympathetic Nervous System.
The stress response is inbuilt to protect the person by Fight or Flight.
How Stress Damages Body through Overactive Sympathetic System?

When there is STRESS energy for flight or fight is brought by diverting or cutting energy supply that is normally required for digestion, for fighting illnesses or for orgasm.

The increase in your heart-rate, blood pressure, and rate of respiration is fueled to race your muscles and sharpen your sensory apparatus.

High levels of persistent (chronic) stress due to change in Life Style keeps the sympathetic system in an accelerated mode. Your immune system, digestive system, well being, mind suffers.

Cheers!
Source:
www.cerebromente.org

http://www.cerebromente.org.br/n03/mente/orgasmale_i.htm

www.macalester.edu

http://www.macalester.edu/psychology/whathap/ubnrp/orgas03/males.html