Sexual Arousal Changes in the Vulva

Sexual arousal results in a number of physical changes to the labia/vulva area. Arousal may be broken up into four phases: Excitement, Plateau, Orgasm, and Resolution.

Excitement
Vaginal lubrication begins first. This is caused by vasocongestion of the vaginal walls. Increased blood pooling there causes moisture to seep from the vaginal walls. These droplets collect together and flow out of the vagina, moistening the vulva. The amount of vaginal lubrication is not necessarily indicative of the level of sexual arousal. The labia majora flatten and spread apart, and the clitoris and labia minora increase in size.

Plateau
Increased vasocongestion in the vagina causes it to swell, decreasing the size of the vaginal opening by about 30%. The clitoris becomes increasingly erect, and the glans moves towards the pubic bone, becoming concealed by the hood. The labia minora increase considerably in thickness, approximately 2–6 times, causing them to spread apart, displaying the vaginal opening. The labia minora are two soft folds of skin within the labia majora.

Orgasm
Immediately prior to the female orgasm, the clitoris becomes exceptionally engorged, causing the glans to appear to pull back into the clitoral hood. This is thought to protect the sensitive glans during orgasm.

During a woman’s orgasm, rhythmic muscle contractions occur in the outer third (opening) of the vagina, as well as the uterus and anus. They occur initially at a rate of about one every 0.8 seconds, becoming less intense and more randomly spaced as the orgasm continues. An orgasm may have as few as one or as many as 15 or more contractions, depending on its intensity. Orgasm may be accompanied by female ejaculation, causing liquid from either the Skene’s gland or bladder to be expelled through the urethra.

Immediately after orgasm the clitoris may be so sensitive that any stimulation is either exciting or uncomfortable.

Histamine is a chemical that helps trigger an orgasm. Histamine is also released during an orgasm. Folic acid (folate) regulates the production of histamine. Enjoying foods rich in folate helps increase libido, sexual intensity and pleasure. Deficiencies of L-Histidine also effect histamine levels.

Without the free passage of blood cells to the sex organs, sexual sensation decreases. Proper blood flow allows labia/vulva tissues to become engorged, aroused and lubricated. Relaxed blood vessels increase blood flow (for men & women), this is why yoga and exercise that focuses on the pelvic area enhances sexual arousal and pleasure.

Keira SomaAbout the Labia, Vulva, Clitoris
The vulva has many major and minor anatomical structures, including the labia majora, mons pubis, labia minora, clitoris, bulb of vestibule, vulvar vestibule, greater and lesser vestibular glands, and the opening of the vagina.

Clitoris Sensitivity
A woman’s clitoris is exquisitely sensitive because the clitoris contains at least 8,000 sensory nerve endings. One quarter of the clitoris is visible; the rest of clit, nib is inside the body. The clitoris is made up of many different parts, including the clitoral head, the hood the clitoral shaft, the urethral sponge, erectile tissue, glands, vestibular bulbs and the crura (or the clitoral legs).

Oral lips, Penis, Clitoris and Nipples are very sensitive
Pacini’s corpuscles are mechanoreceptors designed to detect pressure.They populate the oral lips, penis, clitoris, and nipples. Pacini’s corpuscles are located in the deep portion of the dermis (middle skin layer) and in the subcutaneous fat (bottom skin layer).

Erogenous Zone an area of the body that has heightened sensitivity, the stimulation of which may generate a sexual response, such as relaxation, the production of sexual fantasies, sexual arousal and orgasm.


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