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Based upon "Resonant Excitation Of Sexual Orgasms - Tao Of Love Coupling"
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Case Study -  Premature ejaculation for young men and sexual orgasm.

Reader 1: 8/29/2001>
I would like to know how to longer my sexual intercourse time, it seems that when i have sex i cannot last as long as i want to, is that due to anxiety? when i masturbate i can go for as long as i want, but when im actually having sex i cannot last nearly as long as i wnated to, is there anythign i should or should not *think* about ? is it all psycological? thankyou for your time. please respond, this is a very big issue for both me and my partner

Dr. Lin: 8/30/2001>
This article can help you out.

It seems your erection is insufficient and your ejaculation volume (semen) is low.
When you masturbate, you don't have to worry about your erection, and with a low volume of semen in your seminal vesicles, there is no seminal pressures and insufficient prostaglandins to stimulate your prostate for erection. Once you have to worry about holding up your erection, you will exercise your PC/prostate muscles to assist your erection. Once you do that, you trigger your prostate's nerves for ejaculation.

If your erection is hard and your ejaculation volume (semen) is high, masturbation will make you come very quickly with a power seminal jet shooting out.
If your erection is weak, your sympathetic nerves are very active (or your serotonin level is low), and your ejaculation volume (semen) is high, your semen will spurt very quickly.

During lovemaking, her vagina bioelectric power, tightness, and prostaglandins secretion will make your come very quickly if your serotonin level is too low or when your prostate's nerves and tissues are abraded by over-ejaculation. This article can help you out,
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