The display of secondary sex characteristics in humans such as a penis-like enlarged clitoris in females during arousal and gynecomastia in males are thought to have once been objects of mate selection in human evolution because of the persistence of the phenomenon of these features invoking sexual arousal for potential mates in cross-cultural studies. Proceeding from these experimental results, Tarkhanov put forward a hypothesis that filling and evacuation of the seminal vesicles were the main biological cause which led to sexual arousal and its disappearance in mammals and humans.
Typically, men are sexually aroused more easily than women. It plays a key role in sexual arousal in males, with strong effects on central arousal mechanisms.
It has been suggested that this model was much like a metaphor for a steam boiler. Animal sexual behaviour Two birds that appear to be exhibiting affection While human sexuality is well understood, scientists do not completely grasp how other animals relate sexually.
The source of individual variability on the sexual excitation and inhibition systems is not known definitively. Women are physically capable of returning to the plateau phase of the sexual response cycle immediately following orgasm, but men are not able to achieve an erection until they complete a refractory period and enter the resolution phase of sexual response. After orgasm, some women do not want any further stimulation and the sexual arousal quickly dissipates. Blood flow to the pelvis and genitals increases and the nipples harden.
However, it is unclear whether higher levels of testosterone cause increased arousal and in turn multiple partners or whether sexual activity with multiple partners cause the increase in testosterone. It may be very subtle or may involve the entire body and result in a brief loss of awareness.
If sexual stimulation continues, then sexual arousal may peak into orgasm. Once erect, his penis may gain enough stimulation from contact with the inside of his clothing to maintain and encourage it for some time. Motivation and behaviour are organized hierarchically ; each are controlled by a combination direct external stimuli and indirect internal cognitions factors.
Posted by: Femi | on October 2, 2012
The intensity of orgasm varies from person to person and with each sexual experience. More recently, laser doppler imaging LDI has been used as a direct measure of genital sexual arousal in women.
While young women may become sexually aroused quite easily, and reach orgasm relatively quickly with the right stimulation in the right circumstances, there are physiological and psychological changes to women's sexual arousal and responses as they age. 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. After orgasm, some women do not want any further stimulation and the sexual arousal quickly dissipates.
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