They eventually increase in speed and intensity as the orgasm approaches, until a final "plateau" (the orgasmic) pleasure sustained for several seconds.During orgasm, a human male experiences rapid, rhythmic contractions of the anal sphincter, the prostate, and the bulbospongiosus muscles of the penis. The sperm are transmitted up the vas deferens from the testicles, into the prostate gland as well as through the seminal vesicles to produce what is known as semen. The prostate produces a secretion that forms one of the components of ejaculate. Except for in cases of a dry orgasm, contraction of the sphincter and prostate force stored semen to be expelled through the peniss urethral opening. The process takes from three to ten seconds, and produces a pleasurable feeling. Ejaculation may continue for a few seconds after the euphoric sensation gradually tapers off. It is believed that the exact feeling of "orgasm" varies from one man to another. After ejaculation, a refractory period usually occurs, during which a man cannot achieve another orgasm. This can last anywhere from less than a minute to several hours or days, depending on age and other individual factors. Females
A womans orgasm may, in some cases, last a little longer than a mans. Womens orgasms have been estimated to last, on average, approximately 20 seconds, and to consist of a series of muscular contractions in the pelvic area that includes the vagina, the uterus, and the anus.
Although sexual function and sexuality after spinal cord injury is very often impacted, this injury does not deprive one of sexual feelings such as sexual arousal and erotic desires.Scientific literature focuses on the psychology of female orgasm significantly more than it does on the psychology of male orgasm, which "appears to reflect the assumption that female orgasm is psychologically more complex than male orgasm," but "the limited empirical evidence available suggests that male and female orgasm may bear more similarities than differences. In one controlled study by Vance and Wagner (1976), independent raters could not differentiate written descriptions of male versus female orgasm experiences". Males
Variabilities
In men, the most common way of achieving orgasm is by physical sexual stimulation of the penis. This is usually accompanied by ejaculation, but it is possible, though also rare, for men to orgasm without ejaculation (known as a "dry orgasm"). Prepubescent boys have dry orgasms. Dry orgasms can also occur as a result of retrograde ejaculation, or hypogonadism. Men may also ejaculate without reaching orgasm, which is known as anorgasmic ejaculation. They may also achieve orgasm by stimulation of the prostate (see below). Two-stage model
The traditional view of male orgasm is that there are two stages: emission accompanying orgasm, almost instantly followed by a refractory period. The refractory period is the recovery phase after orgasm during which it is physiologically impossible for a man to have additional orgasms. In 1966, Masters and Johnson published pivotal research about the phases of sexual stimulation.