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How Vaginas Work

Unambiguous experimental evidence for the existence of the Tarkhanov regularity in human sexual behaviour has never been obtained. Still, even when the external clitoris isn't being stimulated during vaginal intercourse, the internal clitoral tissue might be getting a good dose of friction. The increased blood flow helps to spur the production of vaginal lubrication, and causes swelling in the clitoris, labia minora, labia majora, and vagina. There are many reasons why a person fails to be aroused, including a mental disorder, such as depression, drug use , or a medical or physical condition. 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. This is usually a clear, odourless secretion from the Skene's gland or bladder that comes out of the urethra.
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Category:Vaginal lubrication - Wikimedia Commons

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 vagina expands and lengthens, too, as the uterus is pulled upward into the body, changing the position of the cervix. Erotic stimuli may originate from a source unrelated to the object of subsequent sexual interest. If sexual stimulation continues, then sexual arousal may peak into orgasm. Because women's arousal is harder to detect, and because women's orgasms aren't essential to reproduction, many people -- both men and women -- assumed that sex was something women put up with to have babies, not something that could be enjoyed.
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Vulva Sexual Arousal

Aroused vulva video



Description: The most obvious response involved with sexual behaviour in males is penile erection. As sexual stimulation continues, orgasm begins, when the muscles of the pelvic floor , the vas deferens between the testicles and the prostate , the seminal vesicles and the prostate gland itself may begin to contract in a way that forces sperm and semen into the urethra inside the penis. If the level of this tension reaches threshold, sexual arousal occurs as the expression of necessity to let off steam. However, current research studies suggest that many animals, like humans, enjoy sexual relations that are not limited to reproduction. Thermography provides a direct measure of genital sexual arousal by measuring changes in temperature associated with increased blood flow to the external genital tissues.

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