Abstract: A device for treatment of erectile dysfunction is disclosed herein. The device has a stretchable ring to retract and maintain the foreskin of the penis a throughout sexual activity, and a stretchable tether coupled to the ring. An anchor end of the tether is mountable at a tailbone of the user, causing the tether to pull on the ring. The device is operative to increase the length of the sliding interface of the penis during sexual activity. The device operative to stimulate the stretch-sensitive nerve endings of the foreskin before and during sexual activity. The device increases stimulation of the sensitive nerve endings of the glans during sexual activity. The device retains blood within the penis upon erection, increasing the ability of the user to maintain an erection for a longer period and to achieve an erection more reliably. The device further increases the appearance of a larger penis.