Retreat bleeding is not allowed to have intercourse. Retreat bleeding is vaginal bleeding after the use of contraceptive pills containing estrogen and progestin, retreat bleeding is a relatively normal physiological phenomenon, do not worry. However, it is not possible to have intercourse when there is withdrawal bleeding, which can cause great harm to a woman’s body: 1. It may cause inflammation after intercourse, such as pelvic inflammatory disease, cervicitis and adnexitis, and may even lead to infertility. 2. It is also because if intercourse occurs, it may lead to blood reflux causing endometritis, or lead to ovarian chocolate cysts. 3. During the time of withdrawal bleeding, the endometrium will also shed, so a traumatic surface will be formed and intercourse will cause an increase in bleeding. Therefore, women can have intercourse after the end of the withdrawal bleeding.