Women have sex for a long time will not be harmful, because sex is a normal physiological activities, normal physiological activities will not cause harm to the body. If you do not pay attention to the process of sexual life may cause harm: a. If you do not pay attention to the hygiene of sexual life may lead to genital infection, because in the process of sexual life may lead to the invasion of bacteria into the vagina, and cause vaginal inflammation or cervical inflammation, bacteria retrograde infection may also cause inflammation of the pelvic cavity, so the time of sexual life must pay attention to hygiene. Second, if you do not plan to get pregnant during sex but no contraception, it will also cause harm to the body, not to take contraceptive measures may cause pregnancy, pregnancy requires abortion or drug abortion, and even some people need to do induced abortion will cause harm to the body. Sex is a normal activity that does not cause harm to the body, but the process of sex should pay attention to hygiene, and no pregnancy plans to pay attention to contraception.