Sex life normal time in 10 ~ 20 minutes or so, depending on personal constitution and physical condition, too long or too short time will have a certain impact on sex life. 1. Too short a time: may be too much pressure in recent life, resulting in a short time once, may also be caused by premature ejaculation, which will affect the harmony of sexual life, resulting in excessive psychological pressure on men. 2. too long: it will cause friction stimulation of body fatigue, there may be swelling and pain, may also lead to women’s vaginal tear, may also lead to increased blood pressure, the whole body skin vasodilatation, muscle pain, general weakness and other uncomfortable symptoms. Usually do not have too much psychological pressure, ban smoking and alcohol, pay more attention to rest, if the sex life time is too long or too short, to go to the regular hospital in time for examination, to avoid unnecessary damage to the body.