Abstract: A device for affecting or enhancing erection of the penis comprises an external inflatable cuff which encircles the shaft of the penis at its base and extends distally. The cuff is provided with a plurality of volume expandable annular spaces arranged parallel to one another. The spaces are filled with fluid under pressure from a squeeze bulb to affect a tourniquet action. The spaces are inflated sequentially in a proximal to distal direction. As the spaces become sequentially pressurized, the inner diameter of the cuff is reduced, constricting the penis and trapping blood within the shaft and forcing it distally to thereby increase the rigidity of the penis.