Abstract: A hand-held cylindrical device, and method for its use, comprising a flexible collar fitting over a flared flange on one of its open ends and a threaded cap on its other open end. A one-way valve is connected through the threaded cap so that as a penis is inserted into the cylinder, the collar forms a seal around the penis forcing air out of the cylinder through the one-way valve. After insertion, and when the cylinder is partially drawn away from the penis, the one-way valve closes and a vacuum is formed within the cylinder causing blood to be drawn into the penis, thereby enlarging it. Repeated massaging movement of the cylinder, by hand or through an electrical device creating reciprocal movement which is attached to the cap, or the use of a condom within the cylinder, causes more stimulation and additional enlargement until the penis is fully erect.