A tube in the urethra usually means that a catheter is left in place and sex is not possible to avoid adverse effects. When a catheter is left in the male, due to the presence of the catheter, the penis, even if it can be erected, is not able to have sex, only after the catheter is removed and returns to normal, then normal sex can be carried out. When a woman has a catheter in place, sexual intercourse may cause pressure on the urethra, causing local damage to the urethra and easily inducing infection; therefore, both men and women should be prohibited from sexual intercourse after a catheter is in place. After indwelling catheter, we should strengthen the lower body care, pay attention to physiological hygiene, drink more water, more urination, do not pull the urinary catheter, indwelling catheter for a long time, but also should be regularly replaced catheter, observation of catheter drainage, to avoid catheter blockage.