How long can you have intercourse after having a colonoscopy is mainly related to the specific situation of the patient, and you can choose the same night, one day later, three days later, etc. according to different situations. 1. If the colonoscopy examination finds that there is no abnormality in the intestines, you can usually have intercourse the same night after the colonoscopy. 2. If colonoscopy reveals polyps in the intestines and electrocoagulation removal of polyps is performed under colonoscopy, coitus is usually allowed three days after colonoscopy to avoid bleeding or perforation of the wound. However, if bleeding is stopped by clamping after polyp removal, intercourse is usually allowed after one day of rest. 3. If there is active bleeding in the intestines through colonoscopy and there is blood or blood clots on the surface of the stool, then coitus is not allowed after colonoscopy, and the patient should be treated in the hospital immediately. If more bleeding causes anemia or even shock, blood transfusion treatment may be given. 4. If malignant tumor is found in the intestines through colonoscopy, then after colonoscopy, patients should try to rest, avoid coitus, avoid strenuous exercise, and carry out anti-tumor treatment in time. In addition, the interval of coitus will be different for patients with different physical conditions and different stages of the disease, which should be decided according to the specific situation.