Sexual life time is very short for a variety of reasons, men’s sexual life time is generally 4-15 minutes, occasional short time do not have to worry about, such as long-term frequent occurrences are considered to be premature ejaculation. There are many reasons for premature ejaculation, generally considered organic factors, mental state and psychological factors, sexual disharmony and other reasons. 1. Organic factors: Premature ejaculation is caused by clear tissue and organ factors, mainly reproductive system diseases, neurological diseases or systemic diseases. Diseases of the reproductive system include phimosis, epididymitis, seminal vesiculitis, phimosis, etc. Diseases of the nervous system or systemic diseases include spinal cord tumors, cerebrovascular accidents, and physical weakness. 2. Mental state and psychological factors: long-term life and work pressure leads to physical fatigue, poor mental condition, will also be accompanied by premature ejaculation. You need to pay attention to timely relaxation, emotional regulation, to avoid tension, depression and other bad emotions. 3. Sexual disharmony: such as women’s long-term performance of the rejection of sexual life, or even sexual frigidity, need to work together to create a good atmosphere, increase some foreplay, appropriate changes in the environment, more mutual appeasement to improve the symptoms. Premature ejaculation needs to be clear which factors are caused by, it is recommended to go to the hospital to do a detailed examination and evaluation for targeted treatment.