The perfect cum if you are alone with only the vacuum pump. Start with a flaccid penis using the “hand” wand slowly slide the hose off and on your shaft. When it becomes hard stop stroking. Tilt the hose until you start feeling a vibration caused by air escape. Work it as long as you like to drive yourself crazy. The orgasm you have will be long and mind blowing.
My husband uses on of these to get fucking rock hard erections that I love. In the last year his dick has been stretched one inch longer and slightly more girth. Rhonda