This cup utilizes air pressure that fills up each of the 24 cushion chambers in between the sleeve and the plastic outer cup, mimicking the missionary sexual position fantasy. Instead of using sponge or urethane material to fill up space, the air chambers naturally apply even pressure around the inner sleeve, creating a sensational stimulation to the head and shaft of your member - delivering your most intense orgasm ever! The four-fold tightening zones and combination of nubs to convert changes in air pressure squeeze the penis from all sides. The Tenga Air Cushion cup comes with an adjustable air hole foryour desired tightness.