First, the normal time of male sexual activity is 2-6min, and those less than 2min are premature ejaculation. Clinicians believe that the penis can erect, but those who ejaculate before and after entering the vagina and the time is less than 1min are premature ejaculation. Second, men can't control ejaculation independently during sexual activities. Third, there is a 50% chance that men can't make women reach orgasm in sexual life. Fourth, compared with the past, the duration of sexual life has been significantly shortened. For example, the previous sex life time of 20-30 minutes has recently been reduced to 10 minutes, or even shorter. If you are dissatisfied with your sexual partner, it is also considered premature ejaculation. Among so many concepts about premature ejaculation, the only serious problem is the first one. The man's sexual life is less than 1min, and he ejaculates even before or just after entering the vagina. This situation is more serious. Clinical patients don't really have premature ejaculation, but ejaculate too fast, and their wives are dissatisfied, so they can't reach orgasm, which is often caused by psychological factors and lack of skills and methods in sexual life. The basic premise of the diagnosis of premature ejaculation is that both husband and wife must live together for a long time, and the above phenomenon persists before it can be considered as premature ejaculation.