It is also typical for a man to not reach orgasm as a receptive partner solely from anal sex. 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. On this basis, they argued that clitoral stimulation is the source of both kinds of orgasms,   reasoning that the clitoris is stimulated during penetration by friction against its hood; their notion that this provides the clitoris with sufficient sexual stimulation has been criticized by researchers such as Elisabeth Lloyd. As a woman nears orgasm, the clitoral glans retracts under the clitoral hood , and the labia minora inner lips become darker. The symptoms last for up to a week. It has also been shown that oxytocin is produced when a man or woman's nipples are stimulated and become erect. This does not normally affect the intensity of pleasure, but merely shortens the duration.
Data was analyzed from the Australian Study of Health and Relationships, a national telephone survey of sexual behavior and attitudes and sexual health knowledge carried out in —, with a representative sample of 19, Australians aged 16 to Brain scans of both sexes have shown that the pleasure centers of a man's brain show more intense activity than in women during orgasm. In one controlled study by Vance and Wagner , independent raters could not differentiate written descriptions of male versus female orgasm experiences". While Freud provided no evidence for this basic assumption, the consequences of this theory were considerable. A Learning Channel documentary on sex had fiber optic cameras inside the vagina of a woman while she had sexual intercourse. The process takes from three to ten seconds, and produces a pleasurable feeling. This delay can lead to frustration of not reaching orgasmic sexual satisfaction. It may be associated with performance pressure and an unwillingness to pursue pleasure, as separate from the other person's satisfaction; often, women worry so much about the pleasure of their partner that they become anxious, which manifests as impatience with the delay of orgasm for them. Some women exhibit a sex flush , a reddening of the skin over much of the body due to increased blood flow to the skin. They eventually increase in speed and intensity as the orgasm approaches, until a final "plateau" the orgasmic pleasure sustained for several seconds. It's a region, it's a convergence of many different structures. Holstege is quoted as saying, at the meeting of the European Society for Human Reproduction and Development: Except for in cases of a dry orgasm, contraction of the sphincter and prostate force stored semen to be expelled through the penis's urethral opening. It has not been approved for treating sexual dysfunction. Paroxysm was regarded as a medical treatment, and not a sexual release. A study in the BMJ based upon men age 45—59 found that after a ten-year follow-up, men who had fewer orgasms were twice as likely to die of any cause as those having two or more orgasms a week. Therefore, orgasm increases the chances of conceiving with males of a high genetic quality. Brain changes were observed and compared between states of rest, sexual stimulation, faked orgasm, and actual orgasm. Morris suggested that the relative difficulty in achieving female orgasm, in comparison to the male's, might be favorable in Darwinian evolution by leading the female to select mates who bear qualities like patience, care, imagination, intelligence, as opposed to qualities like size and aggression, which pertain to mate selection in other primates. They described a cycle that begins with excitement as blood rushes into the genitals, then reaches a plateau during which they are fully aroused, which leads to orgasm, and finally resolution, in which the blood leaves the genitals. For instance, delayed orgasm or the inability to achieve orgasm is a common side effect of many medications. These pulses are a series of throbbing sensations of the bulbospongiosus muscles that begin in the anal sphincter and travel to the tip of the penis. This reaches a peak at orgasm when the female brain's emotion centers are effectively closed down to produce an almost trance-like state. Masters and Johnson equated male orgasm and ejaculation and maintained the necessity for a refractory period between orgasms. Desmond Morris proposed that orgasm might facilitate conception by exhausting the female and keeping her horizontal, thus preventing the sperm from leaking out.
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