The IUD should not be inserted after intercourse. After coitus, the vaginal environment changes and gynecological inflammation may occur. In this case, it is recommended that the IUD should not be inserted to avoid infection of the uterine cavity, which may result in abdominal pain, fever and other symptoms. There is a possibility of pregnancy after coitus, after coitus should not use the IUD, otherwise it may affect the normal pregnancy, miscarriage, ectopic pregnancy, etc. If there is coitus before the IUD, it is not allowed to use the IUD, it is recommended to use the IUD in the 3-7 days after the menstrual period is cleared, and do not have coitus for one week before the operation and for one month after the operation. If a woman has no reproductive needs, she can have an IUD within one week after her period without having intercourse. At this time, the endometrium is relatively thin, the stimulation of the endometrium is relatively small, and there will be no hemorrhage, and she should pay attention to rest after the operation.