Generally, women can have intercourse 42 days after giving birth. The vulva, vagina, uterus and other reproductive organs have recovered to their pre-pregnancy state, so they can have intercourse. However, it varies from woman to woman. Some women may have a slightly enlarged uterus on ultrasound because of the slow recovery of the uterus. Some women still have a small amount of vaginal bleeding, pain in the cesarean incision and perineal incision area, etc., so intercourse is not allowed because it can lead to painful intercourse and vaginal bleeding after intercourse. The opening of the uterus is not closed, which can easily lead to retrograde infection of bacteria, causing endometritis, pelvic inflammatory disease, etc. In serious cases, it can cause fever, so the time of intercourse should depend on the recovery time of the patient. It is recommended to pay attention to personal hygiene when having intercourse and to take good contraceptive measures to avoid unnecessary harm to the body caused by unwanted pregnancy.