The vulva has many anatomical structures, including the labia majora, mons pubis, labia minora, clitoris, bulb of vestibule, vulval vestibule, greater and lesser vestibular glands, and the opening of the vagina.
As the outer portal of the human uterus or womb, it protects its opening by a "double door": the labia majora (large lips) and the labia minora (small vagina lips).
The vagina is a self-cleaning organ, sustaining healthy microbial flora that flow from the inside out; the vulva needs only simple washing to assure good vulvovaginal health, without recourse to any internal cleansing.
The vulva has a sexual function; these external organs are richly innervated and provide pleasure when properly stimulated. In various branches of art, the vulva has been depicted as the organ that has the power both to "give life" (often associated with the womb), and to give sexual pleasure to humankind.
Sexual Arousal - Excitement
Vaginal lubrication begins first. This is caused by vasocongestion of the vaginal walls. Increased blood pooling there causes moisture to seep from the walls. These droplets collect together and flow out of the vagina, moistening the vulva. The labia majora flatten and spread apart, and the clitoris and labia minora increase in size. Unlike in men, where sexual excitement produces large and readily apparent changes, namely an erection, women are not necessarily aware that vaginal lubrication and blood engorgement of their vaginas have occurred.
Sexual Arousal - 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 2–3 times, causing them to spread apart, displaying the vaginal opening. The labia minora sometimes change considerably in color, going from pink to red in lighter skinned women who have not borne a child, or red to dark red in those that have.
Sexual Arousal - Orgasm
Immediately prior to the female orgasm, the clitoris becomes exceptionally engorged, causing the glans to appear to retract into the clitoral hood. This is thought to protect the sensitive glans during orgasm. Rhythmic muscle contractions occur in the outer third 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.
Sexual Arousal - Resolution
The pooled blood begins to dissipate, although at a much slower rate if an orgasm has not occurred. The vagina and vaginal opening return to their normal relaxed state, and the rest of the vulva returns to its normal size, position and color.
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