The use of a penis pump should not hurt, but rather give a wonderful feeling. Yet there is a small risk involved. If you use it for much longer than twenty to thirty minutes, it can cause minor damage to the penis. Like bruises. These cannot always be seen with the naked eye. It is therefore advisable to read the package leaflet carefully as soon as you have bought the penis pump. When the pressure is increased a bit too much, you also know immediately how to remove the pump from your penis.