The physiology of sex

Sexual addiction Sex Addicts Anonymous Sexual surrogate. Sexual arousal studies involving category-specificity look at genital responses physiological changesas well as subjective responses what people report their arousal levels to be. With an increase of sexual excitation, the tension increases and becomes wholly unpleasurable. Maynard Smith has also written extensively on the "seminal fluid swapping theory" logistic application of the assortment of alleles as a more accurate synthetic depiction of the Hardy—Weinberg principle in cases of severely interbreeding populations. Sexual arousal has several stages and may not lead to any actual sexual activity, beyond a mental arousal and the physiological changes that accompany it.

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Excitation and inhibition of behavior act at various levels of this hierarchical structure.

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It appears that these other factors often have a greater impact on women's sexual functioning than their menopausal status. Similarly, a person's sexual partner will normally also know his or her partner's erotic stimuli and turn-offs. Thermography provides a direct measure of genital sexual arousal by measuring changes in temperature associated with increased blood flow to the external genital tissues. Archived from the original on In the woman, the vagina begins a series of regular contractions; in the man, the penis also contracts rhythmically to expel the sperm and semen ejaculation.

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