Premature ejaculation is mostly physiological, and the fundamental reason is that the stimulation threshold required for ejaculation is low. The reasons for the low stimulation threshold are psychological factors and ejaculation habits. There are three reasons for adolescent premature ejaculation. First, excessive premature masturbation leads to premature ejaculation. Whether masturbation is good or bad, premature delivery (8- 16 years old) and transitional masturbation, the central nervous system and endocrine system in this period are in the stage of growth and development. Excessive masturbation and ejaculation lead to the loss of hormones needed for growth and development. At the same time, it causes great damage to the developing nervous system, and the nerves at the junction of urethra and prostate ejaculatory duct are worn away. These injuries usually lead to premature ejaculation. Teenagers who have experienced this kind of experience are often impulsive in the initial sexual contact, but they can't get an erection. Even if they get an erection, they will show weakness and premature ejaculation will soon appear. Second, premature ejaculation caused by insufficient sexual experience, if it is not frequent nocturnal emission and excessive masturbation, semen produced by sexual organ secretion stimulation will accumulate in the body; No matter the sperm of testis or epididymis, or the secretion of prostate and seminal vesicle, it will reach a certain amount; Coupled with the excitement when I am with my girlfriend, the output of semen is higher than usual, and the accumulation of semen itself is a stimulating impulse, which is the stimulation of ejaculation; Hairless inhibition of sexual desire makes the sexual energy in the body grow and accumulate rapidly, so it is easy to induce premature ejaculation during sexual intercourse. This is a process of energy release. It's like pouring gasoline on dry wood and burning immediately when it meets Mars. Third, premature ejaculation caused by prostatitis The prostate plays an important role in the whole sexual process. Prostate secretes prostaglandin E- 1 and prostaglandin E-2. Prostaglandin E- 1 promotes erection, and prostaglandin E-2 leads to ejaculation. The intima of the prostate is relatively thin, and the secretion of prostatic fluid by the inflamed prostate is affected. At this time, the value of prostaglandin E- 1 is very low, while the value of prostaglandin E-2 is very high. There will be premature ejaculation. This is why people with prostatitis will have erectile weakness accompanied by premature ejaculation, which is the reason. At the same time, the nerve at the junction of prostate and ejaculatory duct is damaged, and the angry urethral nerve is as powerful as a Pentium computer, with visual and auditory stimulation, which will stimulate the gland (as the British anatomist Cowper who discovered this gland said) to produce additional premature ejaculation substances in the pure urethra. This is why people who have a lot of premenstrual fluid before sex ejaculate quickly.