For patients undergoing radiotherapy, it is possible to have intercourse about one week after the completion of radiotherapy. Radiation therapy is a common treatment method for cancer. Radiation is present in the patient’s body, and it is radioactive to the surrounding people, and it takes time for the radiation to fade away. For patients who have undergone radiotherapy, it is best to keep a distance of more than 3m from family members in order to minimize the impact. Patients who have had radiotherapy are very radioactive if they are about 1m away, especially for pregnant women and children, they should try to keep a distance of more than 3m apart. After the end of radiotherapy, the radiation in the body basically disappears completely in a week or so, so you can have intercourse with your husband and wife, and normal life is not affected.