There is no strict clinical limit for how many minutes of sex is considered normal, as long as the normal ejaculation process can be completed, the sex time is greater than 2-6 minutes, and both parties have a harmonious sex life, are considered normal. Generally speaking, most of the sex life can last for 5-30 minutes. In addition, it should be noted that too long or too short sex life is not normal, should consider the existence of pathological factors. If the sexual life is too short, less than 2 minutes, may be the occurrence of premature ejaculation, premature ejaculation refers to the completion of ejaculation before entering the vagina or sexual life time less than 2 minutes. In this case, first of all, we should relieve the mental stress, too much tension caused by too much stress may cause premature ejaculation; secondly, we should go to the urology male department for consultation and treatment, and we can use drugs such as dapoxetine and sertraline under the guidance of doctors to improve the symptoms of premature ejaculation. If sex takes too long, such as more than 1 hour before ejaculation, conditions such as delayed ejaculation or ejaculation disorder need to be considered, which can be improved by psychotherapy and behavioral therapy. So there is no need to be too obsessed with time, because too long sex can lead to fatigue, which is not conducive to normal life and work, but may also cause reduced glans sensitivity, or lack of orgasm; the prostate, penis continued long time congestion is also prone to induce prostatitis and other diseases. In addition, if there is no intention to get pregnant, before having sex to do a good contraceptive measures, and pay attention to the cleanliness of both private parts to avoid infection. The woman should also avoid having sex during her menstrual period, because the menstrual blood may backflow and cause inflammatory infections.