In some recent studies, authors tend to adopt the opposite point of view that there are no remarkable EEG changes during ejaculation in humans. As orgasm becomes imminent, the outer third of the vagina tightens and narrows, while overall the vagina lengthens and dilates and also becomes congested from engorged soft tissue. This does not normally affect the intensity of pleasure, but merely shortens the duration. 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. It has also been shown that oxytocin is produced when a man or woman's nipples are stimulated and become erect. After ejaculation, a refractory period usually occurs, during which a man cannot achieve another orgasm. Some women exhibit a sex flush , a reddening of the skin over much of the body due to increased blood flow to the skin. It has not been approved for treating sexual dysfunction. 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.
Holstege is quoted as saying, at the meeting of the European Society for Human Reproduction and Development: Orgasm by psychological stimulation alone was first reported among people who had spinal cord injury. They assert that since the front wall of the vagina is inextricably linked with the internal parts of the clitoris, stimulating the vagina without activating the clitoris may be next to impossible. In one controlled study by Vance and Wagner , independent raters could not differentiate written descriptions of male versus female orgasm experiences". He "concluded that satisfaction from penile penetration [is] mainly psychological or perhaps the result of referred sensation". In , they published the first complete 3D sonography of the stimulated clitoris, and republished it in with new research, demonstrating the ways in which erectile tissue of the clitoris engorges and surrounds the vagina, arguing that women may be able to achieve vaginal orgasm via stimulation of the G-spot because the highly innervated clitoris is pulled closely to the anterior wall of the vagina when the woman is sexually aroused and during vaginal penetration. The British biologists Baker and Bellis have suggested that the female orgasm may have a peristalsis or "upsuck" action similar to the esophagus ' ability to swallow when upside down , resulting in the retaining of favorable sperm and making conception more likely. Masters and Johnson equated male orgasm and ejaculation and maintained the necessity for a refractory period between orgasms. While Freud provided no evidence for this basic assumption, the consequences of this theory were considerable. 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. Many women felt inadequate when they could not achieve orgasm via vaginal intercourse alone, involving little or no clitoral stimulation, as Freud's theory made penile-vaginal intercourse the central component to women's sexual satisfaction. In , Freud stated that clitoral orgasms are purely an adolescent phenomenon and that upon reaching puberty, the proper response of mature women is a change-over to vaginal orgasms, meaning orgasms without any clitoral stimulation. It can additionally be achieved by stimulation of the nipples or other erogenous zones , though this is rarer. Blair , published in the Journal of Sex Research, found that women in same-sex relationships enjoyed identical sexual desire, sexual communication, sexual satisfaction, and satisfaction with orgasm as their heterosexual counterparts. In some recent studies, authors tend to adopt the opposite point of view that there are no remarkable EEG changes during ejaculation in humans. Anorgasmia is significantly more common in women than in men,   which has been attributed to the lack of sex education with regard to women's bodies, especially in sex-negative cultures, such as clitoral stimulation usually being key for women to orgasm. Fertility There are theories that the female orgasm might increase fertility. It is believed that the exact feeling of "orgasm" varies from one man to another. They found that using this metric they could distinguish from rest, voluntary muscular contractions, and even unsuccessful orgasm attempts. The process takes from three to ten seconds, and produces a pleasurable feeling. One study examined 12 healthy women using a positron emission tomography PET scanner while they were being stimulated by their partners. This can last anywhere from less than a minute to several hours or days, depending on age and other individual factors. Sexual dysfunction overall becomes more likely with poor physical and emotional health. Generally, the more practices engaged in, the higher a woman's chance of having an orgasm. Regarding these changes, Gert Holstege said in an interview with The Times , "What this means is that deactivation, letting go of all fear and anxiety, might be the most important thing, even necessary, to have an orgasm.
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