Premature ejaculation is the most common ejaculatory dysfunction, with the beginning of sexual intercourse that is the discharge of semen, or even before sexual intercourse that is the discharge of semen, can not carry on a normal sex life as the main performance, according to the type of premature ejaculation, the symptoms are different. 1. Primary premature ejaculation: that is, from the first sexual experience, there is a continuous occurrence of premature ejaculation, almost every sexual intercourse, and every sexual partner will have ejaculation quickly, the delay time of the bulbocavernosus reflex (BCR) is shorter. 2. Secondary premature ejaculation: it means that before the occurrence of premature ejaculation, there was a period of time when the sexual function was normal, which may appear gradually or suddenly, and may be secondary to urological diseases, thyroid diseases or psychological diseases, etc., and the delay time of the bulbocavernous reflex (BCR) is longer. 3. Situational premature ejaculation: the ejaculation time of such patients is long or short, and premature ejaculation occurs from time to time. This kind of premature ejaculation is not necessarily all pathological process. The clinical manifestation of premature ejaculation is mainly rapid ejaculation. Take time as the standard: from the penis inserted into the vagina to the time of ejaculation, generally considered shorter than 2 minutes is premature ejaculation. Take the number of strokes as the standard: the penis inserted into the vagina less than 10 times to 30 strokes for premature ejaculation.