The reasons for too fast intercourse include drug side effects, chronic prostatitis, excessive penile sensitivity, mental factors, and poor lifestyle. 1. drug side effects: some people in the past sex life, blindly use to improve sexual ability, increase the durability of the drug, such as sildenafil citrate tablets, long-term use may lead to their own sexual function, thus appearing too fast intercourse. 2. Chronic prostatitis: inflammatory stimulation of the prostate gland can lead to inflammatory enlargement of the prostate gland, retrograde infection can lead to inflammation of the seminal vesicles, so that the seminal vesicles premature contraction, thus appearing to be too fast. 3. High sensitivity of the penis: long-term masturbation and early sexual life may cause high sensitivity of the penis and glans, thus leading to premature intercourse. 4. Mental factors: such as mental over-excitement or nervousness, excessive fatigue, or poor relationship with sexual partners, may also lead to sexual intercourse too fast. 5. Bad lifestyle: such as long-term smoking, alcoholism, late at night, lack of exercise, etc., can lead to a decline in the physical quality of men, which can lead to sexual intercourse too fast. When the situation of frequent intercourse too fast, the patient should go to a professional hospital to find out the cause of the disease, under the guidance of the doctor to carry out treatment, do not blindly self-medication.