She stated that emotions of anxiety, defensiveness and the failure of communication can interfere with desire and orgasm. It's a region, it's a convergence of many different structures. 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. Women were more likely to reach orgasm in encounters including cunnilingus". 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 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.
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. In contrast to the two-stage model of male orgasm, Kahn equalized orgasm and ejaculation and stated that several orgasms can occur and that "indeed, some men are capable of following [an orgasm] up with a third and a fourth" orgasm. In one controlled study by Vance and Wagner , independent raters could not differentiate written descriptions of male versus female orgasm experiences". At least one scientific study supports these claims,  although cabergoline is a hormone-altering drug and has many potential side effects. 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. In addition to observing that the majority of their female subjects could only have clitoral orgasms, they found that both clitoral and vaginal orgasms had the same stages of physical response. Rather than orgasm being the peak of the sexual experience, she suggested that it is just one point in the circle and that people could feel sexually satisfied at any stage, reducing the focus on climax as an end-goal of all sexual activity. Having used MRI technology which enabled her to note a direct relationship between the legs or roots of the clitoris and the erectile tissue of the "clitoral bulbs" and corpora, and the distal urethra and vagina, she stated that the vaginal wall is the clitoris; that lifting the skin off the vagina on the side walls reveals the bulbs of the clitoris—triangular, crescental masses of erectile tissue. Therefore, orgasm increases the chances of conceiving with males of a high genetic quality. This can last anywhere from less than a minute to several hours or days, depending on age and other individual factors. 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 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. Brain There have been very few studies correlating orgasm and brain activity in real time. They argue that the presence of this particular frequency of contractions can distinguish between voluntary contraction of these muscles and spontaneous involuntary contractions, and appears to more accurately correlate with orgasm as opposed to other metrics like heart rate that only measure excitation. In some recent studies, authors tend to adopt the opposite point of view that there are no remarkable EEG changes during ejaculation in humans. This possibility, sometimes called the "Poleaxe Hypothesis" or the "Knockout Hypothesis", is now considered highly doubtful. Differences were reported in the brains of men and women during stimulation. A Learning Channel documentary on sex had fiber optic cameras inside the vagina of a woman while she had sexual intercourse. This delay can lead to frustration of not reaching orgasmic sexual satisfaction. They found that using this metric they could distinguish from rest, voluntary muscular contractions, and even unsuccessful orgasm attempts. Orgasm by psychological stimulation alone was first reported among people who had spinal cord injury. 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 some instances, the series of regular contractions is followed by a few additional contractions or shudders at irregular intervals. It is believed that the amount by which oxytocin is increased may affect the length of each refractory period. After ejaculation, a refractory period usually occurs, during which a man cannot achieve another orgasm.
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