Sexual life how long a normal varies from person to person, different physique and different age, the number and frequency of sexual life varies greatly. The general situation 20-30 years old young people, the number of sexual life is more frequent, generally 3-5 times a week. People aged around forty, 2-3 times a week are normal. The frequency of sexual life can not be measured by the number of times, not fatigue, does not affect the normal work and life, no physical discomfort even if it is normal, so it can not be generalized. It is recommended to pay attention to the hygiene of the perineum of men and women before and after sex, and if there is no plan to prepare for pregnancy, it is best to take safe and effective contraceptive birth control measures to avoid causing unwanted pregnancy.