For most lung cancer patients, sex is harmless and a reasonable and regulated sex life is beneficial to their physical and mental recovery. However, in some cases, sexual life is dangerous for lung cancer patients. During the recovery period after surgery (1 month after surgery), sexual intercourse may cause bleeding or strain the wound, and sometimes increase the chance of infection. Therefore, the time to resume sexual intercourse after surgery depends on the specific situation, which depends on the type of surgery and the degree of wound healing, and the doctor’s opinion can be sought. 2, during radiotherapy can have sex patients receiving radiotherapy, chemotherapy patients often experience the stage of low body immune function. During this period, the patient is most likely to be infected, so it is best to consult a doctor if you can have sex. Most people believe that if a patient is well enough to go out in public, sex is generally not dangerous. However, if the patient is immunocompromised due to radiotherapy, avoid sex as much as possible to avoid unnecessary infection. 3. Precautions for sex life of lung cancer patients During radiotherapy, due to the application of drugs, patients are prone to impotence and sexual indifference, so partners should understand and support them. During sexual life, patients should avoid the decrease of immunity caused by excessive fatigue, and try to adopt positions that are conducive to patient’s rest (e.g. male patients, male down position can be used). In addition, during radiotherapy and chemotherapy, patients should pay special attention to prevent the spread of sexually transmitted diseases. The risk of genital herpes or gonorrhea infection increases when the patient is immunocompromised. Urination after sexual intercourse facilitates the flushing out of bacteria that can cause infections in the external genital area, so it is good practice to drink some water before sex to facilitate urination after intercourse.