You can’t have sex until half a month after the IUD is inserted. The reason is that no matter which kind of IUD is put on, it will cause more or less damage to the uterine lining, and the repair of the uterine lining will take about half a month. In addition, the IUD enters the uterine cavity through the cervix, causing damage to the cervical mucosa. If you have sex too soon, pathogenic bacteria will invade the damaged mucosa or the endometrium, resulting in cervicitis and endometritis, which can cause excessive leukorrhea or pain in the lower abdomen. So after the IUD, not only should you keep your vulva clean, change sanitary napkins regularly, but also pay attention to half a month before having intercourse.