They also argue that the appearance of a greater individual variability in female genital response than in male genital response is consistent with a representative female sample and a male sample subject to bias that leaves much of the individual variability unstudied, with a reference to the neurological observation that all brain structures display significant individual variability in both sexes and that no[ brain structure is variable only in females and not in males. The degree to which genital and subjective sexual response correspond is termed concordance. As the testicles continue to rise, a feeling of warmth may develop around them and the perineum. If sexual stimulation continues, then sexual arousal may peak into orgasm. This hypothesis suggests that, provided there is enough of an increase in vaginal blood flow for vaginal lubrication to occur in a sexual context, the magnitude of arousal need not be consistent. It can be as long as a few hours or days in mid-life and older men.
Once this has started, it is likely that the man will continue to ejaculate and orgasm fully, with or without further stimulation. As of yet, the differences in scores between genders have not been explained beyond the theoretical level. 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. One lower order factor in the SESII-W labeled Arousal Contingency was particularly relevant; this factor explains the easy disruption of sexual arousal. Regardless of the difference in these two questionnaires, both surveys' scores show normal distribution verifying the hypothesis that there is a normal individual variation in sexual arousal and inhibition. Basson emphasizes the idea that a lack of spontaneous desire should not be taken as an indication of female sexual dysfunction ; many women experience sexual arousal and responsive desire simultaneously when they are engaged in sexual activity. After their mid-forties, some men report that they do not always have an erection when they are sexually aroused. In terms of brain activation, researchers have suggested that amygdala responses are not solely determined by level of self-reported sexual arousal; Hamann and colleagues  found that women self-reported higher sexual arousal than men, but experienced lower levels of amygdala responses. None of similar states of physiological deficiency responsible for the periodical appearance of sexual arousal has been revealed in human sexuality. Sexual arousal studies involving category-specificity look at genital responses physiological changes , as well as subjective responses what people report their arousal levels to be. Other factors have also been studied including socio-demographic variables, health, psychological variables, partner variables such as their partner's health or sexual problems, and lifestyle variables. Such an approach assumes sexual arousal to be a spontaneous desire that appears periodically like sensations of hunger and thirst. Category-specificity[ edit ] Category-specificity refers to a person showing sexual arousal to the categories of people they prefer to have sex with. However, the specific roles of these hormones are not clear. The cognitive aspects of sexual arousal in men are not completely known, but it does involve the appraisal and evaluation of the stimulus, categorization of the stimulus as sexual, and an affective response. For instance, an external stimulus may directly excite sexual arousal and motivation below a conscious level of awareness, while an internal cognition can elicit the same effects indirectly, through the conscious representation of a sexual image. The second stage, approach response, progresses from the first and involves bodily movements towards the object. For centuries, the assumption was made that the longing for sexual interaction was innate, and an inner drive model was used to explain it. Unambiguous experimental evidence for the existence of the Tarkhanov regularity in human sexual behaviour has never been obtained. This view also assumed that there was some adverse physical consequence of not releasing the pressure. Similarly, labial thermistor clips measure changes in temperature associated with genital engorgement; this method directly measures changes in temperature of the labia. The use of the volume or circumference change during penile erection as a convenient measure of sexual arousal was first developed by Kurt Freund. Models of human sexual response[ edit ] Human sexual response cycle[ edit ] Main article: If the level of this tension reaches threshold, sexual arousal occurs as the expression of necessity to let off steam. In older women, decreased pelvic muscle tone may mean that it takes longer for arousal to lead to orgasm, may diminish the intensity of orgasms, and then cause more rapid resolution. With an increase of sexual excitation, the tension increases and becomes wholly unpleasurable.
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