Physiological responses to sex

It should be noted that physiological responses to sex orgasm, the uterus contracts, and some women experience painful contractions after orgasm; however, this does not lead to premature delivery. The scrotum dartos, cremaster contracts. Sexual dysfunctions should be assessed objectively and managed according to the cause—not according to the status, orientation, or age of the affected client. A woman is not anorgasmic if she can achieve orgasm through means other than penile-vaginal stimulation.

Physiological responses to sex
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The physiological basis of human sexual arousal: neuroendocrine sexual asymmetry.

Orgasm may involve intense spasm and loss of awareness, or it may be signaled by as little as a sigh or subtle relaxation. Heart rate and blood pressure increase, body muscles tense, sexual flush occurs, nipples become erect, physiological responses to sex and pelvic blood vessels become engorged, and involuntary and voluntary muscles contract. Lubrication in the male is a parasympathetic response. This is sometimes confused with retrograde ejaculation—a condition in which the man ejaculates into his bladder instead of out through the urethra.

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The labia change colors back to normal and the vaginal length and width decreases. Pain usually occurs with penetration but can occur during nonpenetrative genital stimulation as well. Orgasm increases uterine and fallopian tube motility to increase chances of fertilization -- may be due to an increased rate of sperm transport.

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Physiological responses to sex

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