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Based upon "Resonant Excitation Of Sexual Orgasms - Tao Of Love Coupling"
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News updated:

Case Study:  Why watching erotic images or video clips or even a short sexual though gives this doctor  post-sex arousal trauma disorders - fatigue, dark eye circles, and chilly feeling, even without ejaculating
Reader: 8/02/2009>
Dear Prof. Dr. Lin,

    I would like to ask you why when I observe erotic images or clips or even just short thinking to sexual issues, and a bit stimulation, I become so fatigue and I get a dark circle around my eyes maybe fat tissue within the skin beneath my eyes become depleted ! then I feel cool in my extremes and whats the treats and maybe cure? (please generic medication if needed).

best regards.

R. T. St. D.D.S.- AUST .. A.L.S.

Dr. Lin: 8/02/2009>
Visual stimulation or sexual thought directly stimulates the dopamine-hypothalamus-pituitary-adrenal and testicular axis, and trigger the dopamine-norepinephrine/epinephrine conversion in the hypothalamus and adrenal medulla in activating the sympathetic nervous function,  pro-inflammatory/anti-inflammtory cytockins, and the production of the prostaglandins  and most of normal situations,  it elevates androgen hormones such as DHEA, testosterone, DHT and power up the dopamine , acetylcholine, serotonin and GABA nervous function in supporting the sexual arousal and orgasm. But, if your hypothalamus-pituitary-adrenal and tseticular axis are too exhausted, your norepinephrine, epinephrine and prolactin will be excessively release to force the binding of norepinephrine and epinephrine into the adrenergic alpha receptors for arterial and venous constriction and inflammation in your brain, internal organs (particularly the liver and prostate),  testicles and penis, resulting in castration and post-sexual arousal trauma disorders. Thus, after sexual arousal, even without orgasm or ejaculation,  you get excessive prostaglandin E2,  Prostaglandin D2, alpha-MSH (melanocyte-stimulating hormone),  histamine, norepinephrine and epinephrine, and experiences an abrupt drop of  DHEA, testosterone, DHT, dopamine, acetylcholine, serotonin and GABA.  Excessive excessive prostaglandin E2,  prostaglandin D2 and histamine can gave you itchy eyes like a allergic response.  which, in turn, stimulate skin's melanocytes for the excessive  production and release of melanin (melanogenesis) release from the amino acid tyrosine around the eye tissues  in an attempt to mitigate the inflammatory and allergic responses.
 (Special Note from http://en.wikipedia.org/wiki/Melanin: The photochemical properties of melanin make it an excellent photoprotectant. It absorbs harmful UV-radiation and transforms the energy into harmless amounts of heat through a process called "ultrafast internal conversion". This property enables melanin to dissipate more than 99.9% of the absorbed UV radiation as heat[3] and it keeps the generation of free radicals at a minimum (see photoprotection). This prevents the indirect DNA damage which is responsible for the formation of malignant melanoma. ) The tissues also around the eyes contain a high level of COX enzyme receptors, histamine receptors,  and master cells.  You will feel itchiness and allergy-like responses in your eyes.  Due to the constriction of the arteries and veins, melanin is trapped around the eye cycles leading to darkening of eye cycles.  This also happens in your groins area too. 
Melanin is a skin and hair protector!  
Genetic factors also play the important role in alpha-MSH and melanin release.
If we don't know if there is any medication drugs to stop melanin release and to treat and cure dark eye circles.  You can try anti-melanin or anti-MSH drugs and arterial /venous dilation drugs. 
Recent studies shows glutathione, glycine, L-alanine, L-isoleucine and L-leucine can inhibit melanin synthesis in the reaction of trysinase and L-dopa.  OurViaGrowth-IV contains glutathione, glycine and L-alanine, as well as L-tyrosine
Ref: http://www.ncbi.nlm.nih.gov/pubmed/18670186 , http://www.jstage.jst.go.jp/article/bpb/30/4/677/_pdf  and 

By the way, if you want to solve the post-sex arousal fatigue and trauma, you can take our product ViaPal-hGH-E (3-011) and ArgiNOx (1-018) - http://www.actionlove.com/mail/herbform.htm 
Although Melanin darken your skin and hair, the production of Hydrogen peroxide (H2O2) during sex arousal or orgasm bleaches your hair color.
Dopamine and glutamate are essential for sex. For healthy person, sexual stimulation elevates the dopamine and glutamate synthesis. Excessive dopamine triggers the stress hormone production and promotes the liver P450 enzymes and Monoamine oxidases (MAO) to  deamination of dopamine and stress hormones norepinephrine and epinephrine. In addition to elevating the stress hormones norepinephrine and epinephrine,  chronic excessive sexual stimulation, excessive orgasm, over-masturbation/over ejaculation, or drug abuse will result in excessive glutamate release or accumulation due to a shortage of the enzyme L-glutamic acid decarboxylase and pyridoxal phosphate in efficiently converting elevating glutamate into GABA during sex, or/and due to a shortage of the enzymes gamma-glutamylcysteine synthetase and glutathione synthetase or/and a shortage of  amino acids L-cysteine and glycine, in converting elevating glutamate into the liver detoxification promoter Glutathione.   Elevation of GABA with serotonin, norepinephrine and prolactin after sex or orgasm will trigger the pineal gland to release melatonin for sleeping and restoration;  Elevating of glutathione can reduce the formation of  oxidative toxins, such as Hydrogen peroxide (H2O2),  associated with oxidative injury and cellular/nervous damage.  
Hair graying is a typical example of the hydrogen peroxide (H2O2) damage.  According to the recent study (http://www.fasebj.org/cgi/content/abstract/fj.08-125435v1 ), accumulation of  hydrogen peroxide (H2O2) bleaches human gray/white scalp hair shafts for graying when methionine sulfoxide (Met-S=O) is insufficient to repair in the entire gray hair follicle. It also indicates that  hydrogen peroxide (H2O2) damages hair follicle melanocyte apoptosis and DNA. That is, H2O2-mediated oxidative stress alternate human hair color by blunting methionine sulfoxide repair.  Excessive psychological and physiological stress can interrupt the Methionine-Glutathione Transsulfuration pathway with a lack of the choline-phosphatidylethanolamin synthesis, the phosphatidylcholine synthesis Sex-induced Stress also attack the Hair Follicle Pigmentary unit, and disable or reduce hair pigmentation while hydrogen peroxide (H2O2)  bleaches hair shafts or damages the follicles.

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