The high tension of nerve activity during sex leads to vasoconstriction, which reduces blood supply to the eyes and can aggravate eye fatigue. Excessive sexual intercourse can cause damage to the cervical mucosa and vaginal mucosa, which can lead to vaginal inflammation and cervicitis due to germs invasion. Excessive sexual life also consumes, the body too much physical strength leads to insufficient blood and Qi. Overexertion can cause lumbar muscle strain, which can cause kidney deficiency and urinary tract infections. The normal sex life two to three times a week is appropriate, sexual life should pay attention to the cleanliness of both sides.