The definition of premature ejaculation is more controversial. At first, some people regarded penetration time less than 1 minute as premature ejaculation, while others defined the number of penetration as less than 10 times as premature ejaculation, but there has been no uniform statement. At present, the clinical definition of premature ejaculation is mostly adopted from the Diagnostic and Statistical Manual of Mental Disorders – Fourth Edition (DSM-IV) issued by the American Psychiatric Association: prolonged or recurrent ejaculation occurs after mild sexual stimulation or before, just before, or within a short period of time after penile penetration, which is longer than the time I would like earlier than the person would like. This dysfunction clearly causes distress or interpersonal tension. This type of premature ejaculation is not caused by the direct effect of a substance (e.g. opium). The doctor should consider various factors that affect the duration of sexual arousal, such as age, new sexual partners, new environment and frequency of recent intercourse. For example, younger age, new sexual partners, new environment and less frequent recent sexual intercourse can increase sexual excitement and predispose to premature ejaculation; all these factors can lead to fast ejaculation time, so these causes need to be excluded. The first time the ejaculation occurs, it is not selective to the sexual partner. 2. secondary premature ejaculation: acquired premature ejaculation; normal ejaculation time before premature ejaculation occurs; may occur gradually or suddenly; may be secondary to urological diseases, thyroid diseases or psychological diseases. 3. natural variant premature ejaculation: premature ejaculation is not a continuous 4. Premature ejaculation-like ejaculation disorder: the patient’s ejaculation latency time is often within the normal range, usually 3-6 minutes, or even 20 minutes in some patients, and the patient subjectively believes that he/she is premature, this kind of premature ejaculation cannot be considered as real premature ejaculation, and usually hides a psychological disorder or a problem with Diagnosis of premature ejaculation: In short, there is no exact definition of premature ejaculation, but those who have one of the following symptoms and have persisted for more than 6 months can be diagnosed as premature ejaculation: ejaculation occurs before or when the penis is inserted into the vagina; ejaculation occurs within 1 minute after the penis is inserted into the vagina or with no more than 15 strokes, causing the wife with normal sexual function to fail to achieve orgasm and sexual satisfaction during intercourse , earlier than one’s desire. You can also refer to the Chinese sexual function evaluation scale for premature ejaculation patients.