more sexual creatures than grade-school children are. A girl of three or four gleefully pokes and prods her body and the bodies of adults. She wants to explore her vagina, her clitoris, her anus, any hole or pole she encounters, and much to the distress of her queasy and hypersensitive parents, she may even ask to touch her father's penis. She is polymorphously perverse, as Freud endearingly put it. If she is going to experience the so-called Electra complex, the female equivalent of the Oedipal complex, when a girl loves her father and wants to vanquish her mother, she may do it during this era of the lewd toddler.
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The preschool girl's interest in sex reflects physiology, and the bizarre on-again, off-again dialogue between the gonads and the region of the brain that oversees them. Until girls and boys are three or four, a structure in the hypothalamus called the gonadotropin-releasing hormone pulse generator ticks and tocks and secretes tiny bursts of reproductive hormones. It's like a lighthouse flashing slowly but unerringly in the fog, blip blip blip; every ninety minutes or so, out comes another glint of hormones. A girl's ovaries respond to the pulsatile message. They secrete small amounts of ovarian hormones in return. Nothing serious yet, not nearly enough to grow breasts or ovulate, but still the little girl is slightly waggish and slightly erotic. Her body, all bodies, fascinate her.
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At the end of toddlerhood, through a mechanism that remains largely mysterious, the pulse generator in the brain shuts down. The clock stops. It ceases to secrete hormone signals. The ovaries too fall silent. They retreat into hibernation. For this reason, as well as through the tutelage of social expectations, the child is likely to turn prudish, to be easily embarrassed by bodily functions, and the thought of touching her father's penis, or any penis, or any part of any boy, may well make her gag. For the next seven years or so, she is an asexual, agonadal creature, blissful and free, the way you are on a journey, when you've left behind one set of cares and have yet to greet the new ones.
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The first glimmerings of renewed care and perversity appear at the age of ten, not as a result of gonadal activity but at the behest of another set of organs: the adrenal glands, blood-rich structures that sit atop the kidneys like porkpie hats. Only within the past year or two have researchers discovered the contribution of the adrenals to the first stirrings of adolescence. The adrenals secrete adrenaline, the fire-under-thy-butt hormone, and they also release small doses of sex hormones.
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