Knife injuries need to be based on the site of trauma, as well as the severity of the decision whether or not you can have sex. Whether the body trauma can cohabit, need to be analyzed according to the specific circumstances, if the end of the extremities of the relatively small knife wound, and the local bandage is good, this situation does not affect the cohabit. If there is a relatively large abdominal injury and suture treatment, coitus may lead to bleeding wounds, wound infection, so it is not recommended to have coitus. Lumbar back trauma local bleeding more, temporarily can not cohabit, perineal trauma does not advocate cohabit, if the patient for the head or neck is not serious trauma, can be cohabit. If the patient undergoes localized surgery, such as cervical or vulvar surgery, there should be an interval of at least 2 weeks before coitus, and if the uterus or adnexa undergoes surgery, coitus should be resumed after menstruation. If there is a serious trauma, coitus will have a certain impact on the recovery of the body, it is recommended that the patient should follow the doctor’s advice, appropriate rest, and then consider coitus after the wound has recovered.