Women can have intercourse after 3 to 6 months of pelvic radiotherapy. Radiotherapy is a commonly used treatment for cancerous diseases. The radiation used in radiotherapy can cause damage to normal tissues while destroying tumor cells. When patients undergo radiotherapy in the pelvic area, the vaginal area and the tissues around the vagina will often be irradiated by radiation, which will cause certain damage, resulting in a decrease in the secretion of the vaginal mucosa, vaginal contracture and other changes. Planning to have intercourse before the vaginal area has recovered from pelvic radiotherapy can often lead to unsuccessful intercourse and possibly vaginal damage. Usually, coitus can begin 3 to 6 months after the end of radiotherapy, after the patient has been examined and determined to have recovered well.