How a penis pump works:
1. Create a vacuum: The penis is placed inside the plastic cylinder, and the pump is used to remove air from within the cylinder.
2. Draw in blood: The vacuum created by the pump causes blood to flow into the penis, making it erect.
3. Maintain the erection: Once an erection is achieved, a constriction ring is slid over the base of the penis to keep blood trapped inside and maintain the erection.
4. Release the pressure: The ring can be worn for up to 30 minutes to allow for intercourse.