Every time you have intercourse after the IUD you will not normally bleed, if bleeding occurs, there are several reasons: ovulation period, cervical disease, endometrial polyps and so on. After the IUD, due to some stimulation of the uterine lining, vaginal bleeding may occur during the first few days of the IUD, usually within a week of bleeding time, the amount of bleeding is less than the amount of menstruation. After the endometrium is repaired, there is usually no non-menstrual bleeding or bleeding during intercourse. If a woman bleeds during intercourse, the following factors may exist: 1. Ovulation: During ovulation, due to fluctuations in hormone levels in the body, the endometrium of the woman’s uterus will shed irregularly, and there will be a small amount of vaginal bleeding, which usually lasts for 2 to 3 days and is less than the amount of menstruation. 2. Cervical diseases: Women with cervical diseases, such as cervical polyps, cervical lesions, cervical cancer, etc., may experience contact bleeding, which may occur during coitus. 3. Endometrial polyps: If a woman has endometrial polyps, the endometrial lining will be stimulated by the contraction of the uterus during coitus, which will lead to bleeding at the polyp site, which will be manifested as bleeding during coitus. If you are experiencing bleeding during intercourse, it is important that you seek medical attention in a timely manner so that you do not miss out on your medical condition.