An apparatus for enhancing erection of a penis includes an expandable first member that partially encircles an upper portion of the penis and partially constricts at least a first vein of the penis to reduce the volume of blood carried away from the penis via the first vein. A second member is mounted to the first member includes left and right shoulder sections configured to contact the penis shaft along the left and right sides the urethra. A contoured section is formed between and extends outwards away from the shoulders so that, when the shoulder sections contact the penis shaft and the first member encircles at least partially encircles the upper portion of the penis, the contoured section extends over and does not constrict the urethra.
