look identical until the ninth week of gestation, and our adult organs are analogous structures, male to female. Inside its apricot-sized body, the antesexual two-month-old fetus has a pair of immature seedpods, the primordial gonads, which become testes in males, ovaries in females. It has a set of wolffian and müllerian ducts, one of which will be chosen depending on whether the fetus is to develop a seminal duct system or fallopian tubes. Externally, each begins with an undifferentiated genital ridge, a bump of tissue above a small membrane-shielded slit. Starting in the third month, the nub of flesh either grows gracefully into a clitoris or grows more emphatically into the head of a penis. In girls, the membrane around the primordial slit dissolves, and the slit opens to form the vaginal lips, which will surround the vagina and the urethra, from which urine flows. In boys, androgens prompt the slit to fuse and push forward to generate the shaft of the penis.
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As symbols go, the phallus is a yawn. Tubes that point and shoot, and there you have it. The obelisk pierces the heavens, the gun ejaculates bullets, the cigar puffs like a peacock, the hot rod screams, the hot dog is eaten. A phallus doesn't give you much to play with, metaphorically, and it doesn't lend itself to multiple interpretations. A hose is a hose is a hose.
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But the vagina, now there's a Rorschach with legs. You can make of it practically anything you want, need, or dread. A vagina in its most simple-minded rendering is an opening, an absence of form, an inert receptacle. It is a four-to five-inch-long tunnel that extends at a forty-five-degree angle from the labia to the doughnut-shaped cervix. It is a pause between the declarative sentence of the outside world and the mutterings of the viscera. Built of skin, muscle, and fibrous tissue, it is the most obliging of passageways, one that will stretch to accommodate travelers of any conceivable dimension, whether they are coming (penises, speculums) or going (infants). I'm sure I'm not the only woman who dreamed during pregnancy that she was about to give birth to a baby whale, in my case an endangered blue whale. Oh, the human vagina in its role as birth canal can stretch, all right, and it must distend in proportion to the rest of us far more than the pelvis of a mother whale. You've heard, or experienced firsthand, how the cervix must dilate to ten centimeters, or four inches, before the laboring woman is given sanction to push. It must become as wide as the vagina is long.
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