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Based upon "Resonant Excitation Of Sexual Orgasms - Tao Of Love Coupling"
by Newman K. Lin, Ph.D., PE, a bridge between the Eastern Taoism Sexuality and the Western Engineering Science.==> [ORDERING THE BOOK]< =>[Why?]
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Case Study - Why do tears run down my girlfriends face during intercourse? for sexual orgasm?
Reader: 12/23/2000>
This is not a problem. This is a question. Why do tears run down my girlfriends face during intercourse?

Dr. Lin: 12/27/2000>
At extremely emotional states such as over-excitement, high-level orgasms, extreme happiness and sadness, the brain and nervous systems becomes very sympathetic (highly excited). As a result, a large amount of dopamine in the brain is converted into norepinephrine and then epinephrine (adrenalin). The over-flooding of the adrenalin turns the brains into a "Flight or Fight" state that tenses up the visual, vocal and hearing responses involuntarily (out of control). You can see these responses every time when a person gets into that emotional state. 
At a high-level orgasm, the orgasmic waves pounds the heart and head, resulting in too much adrenalin in the brain, which knocks down the conscience controller - the Cerebral Cortex ( http://actiontao.com/image/path.jpg ).  Thus, at the moment, her face deforms and becomes numbed, her pupil dilates, and the face muscle in her front head tenses so much that her lacrimal glands and/or sac squeeze tear out of her eyes and/or nose.
In fact, any body with such extremely emotions without orgasm will produce teas and nasal discharge.  As of her, her dopamine level is very high and her liver produces too much DOPA decardboxylase for production of Dopamine, Dopamine-Beta-hydroxylase for production of norepinephrine, or/and Phenylethanolamine N-methyltransferase for epinephrine. Too much Dopamine and Norepinephrine in her brain gives her over-excitement in the brain during sex and too much epinephrine dilates her pupils and tense up her lacrimal glands or/and sac too much, resulting in tearing even before orgasm. That is, her brain is over-heated. Increasing her brain's acetylcholine and serotonin levels can prevent the brain's over-heating during sex and allows her to peak up her sexual energy and give her an eruptive orgasm. Most women with the brain's over-heating will result in premature orgasm. For men, it is called mind-driven premature ejaculation - ejaculation upon penetration.

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