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Case Study:  Why chronic over-masturbation/over-ejaculation or drug use resulted in the sympathetic nervous Fight (premature ejaculation) or Flight (going limp) responses to sexual encounter for no more sexual orgasm.
Reader: 12/26/2005>
I am 19. I had a long term girlfriend for about 4 years from 14-18 who was my first sexual partner. We had good sex usually around once or twice a week. I didnt notice any real problems facing me. I was self conscious of showing my body etc at first but with a girlfriend I overcame these problems with her.
We have been parted about 6 months, and I am over her emotionally. 
I am now at university and met a girl I got on with and after a few weeks one night went back to her apartment where we started kissing etc. I was nervous as this was my second girl I had been properly intimate with, and I was a bit self conscious of my penis. I had an erection and asked if she had any condoms. By the time she had brought them over in 20 seconds my penis was limp! I could not get an erection. This was embarressing and we ended up just going to sleep.
Is this problem purely psychological? What can I do to help. I think I am self conscious of the size of my penis. It is 6 inches but fairly slim. Also I am worried about cumming too early. What can I do to help this? I have been masturbating usually once a day, occasionally twice. does this affect things? How often do you have to masturbate before is over-masturbation is suspected?
Please help. I know sex is about confidence, but where can I get this from? How can I stop my fears and self consciousness of my penis?
Kind regards,
Dr. Lin: 12/26/2005>

Your Fight or Flight responses to sexual encounter have been well-addressed in this link -
For young men at your age, over-ejaculation or/and drug abuse are the main causes.
If you contract your PC muscles in assisting your erection, you will turn the "Flight (going limp)" response into the "Fight (Ejaculation)" . 
When your acetylcholine/parasympathetic/serotonin and GABA nervous function fail to modulate your hypothalamus and adrenal function, your hypothalamus and adrenal medulla fire up the excessive dopamine/norepinephrine-epinephrine conversion and your adrenal cortex shoot up your cortisone-cortisol conversion for overheating your brain and the rest of your body fires ( sweating) except your pelvis, testicles and penis where the arteries are constrict to force the boiling blood flow shot up to your brain. Thus, your are in sexual anxiety and panic.
Chronic over-masturbation/over-ejaculation or drug abuse can cause the over-expression of phenylethanolamine-N-methyl transferase and 11Beta-Hydroxysteroid Dehydrogenase Type 1 for the problems. Under an excessive epinephrine and cortisol condition (excessive stress condicion!), the sympathetic nervous fires stop the liver support for the acetylcholine/Nitric Oxide and prostaglandin E-1 production and disable the adrenal and testicular function for DHEA, testosterone and DHT production, essential to your sexual encounter.  This can also ignite an excessive production of prostaglandin E-2 in the prostate, testicles, groins or perineum for pains even if you can no longer erect your penis.  The blueball  phenomenon is one of the sympathetic nervous disorders.

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