1. Operation method: Manual masturbation means that the hand directly touches the penis to move up and down or move in circles to achieve orgasm and ejaculation, and the catheter is designed to be sleeved on the penis, providing friction and stimulation through the inner wall of the catheter, and the user can control the rhythm and speed of the movement by holding the catheter.
2. Tools used: Hand flushing does not need any auxiliary tools, but directly through the touch and feeling of the hand, while the catheter needs special equipment, which can provide a sense of friction and stimulation different from hand flushing.