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If your acetylcholine and serotonin levels are low, but the dopamine (thus, too much adrenalin in the bloodstream) and testosterone levels are high, you should experience premature orgasm, similar to the male premature ejaculation phenomenon,   with the following nervous action sequence: Sensory Nerves => L10-T2 Interneurons => Sympathetic Nerves  => Autorhythmic Fibers in the vagina/clitoris, where the orgasmic pulses are too weak and few to reach the heart and brain's pleasure/cerebral centers and to feel because the nervous action potential has never been coupled into the spinal/central nervous system to the brain/pituitary for the release of oxytocin to initiate the large scale contraction of the contractile fibers.  If the dopamine and testosterone levels, (the dopamine system is the driver of the testosterone production, with the support of the acetylcholine nerves,  liver, and adrenal/ovarian functions ) are too low, you won't have orgasm no matter how hard you stimulate your clitoris, G-spot and Epicenter, and you will abrade and damage your urethral spongy tissues and nerves. Particularly, high-speed vibrators are very destructive for sex organs. 
There is no special technique can raise the brain functions, unless you take ViaGrowth-IV to correct the problems.
The vibrator has damaged your urethral/vaginal spongy tissues and nervous endings. The damage becomes severe when your testosterone, DHEA and acetylcholine levels in the spongy tissues/nervous endings are low.
The detail explanation of the damage done by the high-frequency vibrating devices is given in
http://action.love/cases/case9557.htm  
If you want to repair the damage nerves, you have to take ViaGrowth-IV.
http://action.love/mail/herbform.htm 

The proper stimulation rate on the G-spot and clitoris should not higher than 2.5 strokes (cycles) per second, which is the maximum stimulating rate of the Finger Pliers method,
http://action.love/love/method.htm 
http://action.love/love/resonant.htm 
We have tested this critical stimulation frequency. If I use my Finger Pliers Method ( http://action.love/love/fgplier.htm  ) to stimulate my wife with a pressure of 6 PSI (Pounds per Square Inch), I can bring her to an eruptive Level-7 orgasm in less than 1 minute, provided that her G-spot/urethral spongy tissues are fully erected ( http://www.actiontao.com/image/ewngorge.jpg  ) . If I start with that stimulation rate and pressure before her G-spot/urethral spongy tissues are fully erected, she will experience pain, rather sexual pleasure and orgasm. That is, we have to prepare her urethral spongy tissues for the high-speed stimulation of 2.5 strokes per second, and the intensive high-speed (frequency) stimulation should not last longer than 3-5 minutes. If we don't do so, her urethral/vaginal spongy tissues and nerves will be abraded or irritated. This is also true when we use our 3-point excitation method in which my wife takes the full control of the stimulation speed, pressure and location. That is why we have developed a general lovemaking strategy for orgasm as described in
http://action.love/cases/case7522.htm 
The main purpose for the lovemaking procedures to power up my my penis and fully erect her urethral spongy tissues at the same time, as shown in
http://action.love/extra/lovetool.htm 
When our love tools are fully ready, she can usually achieve a powerful Level-7 orgasm (more description on http://action.love/extra/whatsorgasm.htm) in less than one minutes with our 3-point excitation method and the lovemaking thrusting rate at 2.5 strokes per seconds. 
Usually, she plays a little trick to accelerate her orgasmic responses, as described in
http://action.love/love/chi-sex.htm 
which has been termed as the 4-Point Excitation Method
http://action.love/cases/case8979.htm 
That is, don't apply a high-speed (frequency) stimulation to the delicate urethral spongy tissues, running from the clitoris/vaginal orifice to the G-spot and down to the Epicenter as shown in
http://www.actiontao.com/image/trigger.jpg  ,
for a long duration, say 3-5 minutes; Otherwise, the local nerves get numbed and irritated!

Remember, the vibrator run at an extreme high speed (frequency, I mean), above 10 cycles per second which is much higher than our suggestive upper-limit (critical) stimulation speed of 2.5 strokes per second.