A method of improving penile erections comprises simultaneously stimulating nerves of the ventral and dorsal sides of the penis by simultaneously applying mechanical vibrations to the ventral and dorsal sides of the penis. The vibrations are applied by moving vibratory elements into contact with the penis in directions perpendicular to the ventral and dorsal sides; the vibrations are removed by moving the vibratory elements out of contact with the penis in directions perpendicular to the ventral and dorsal sides; and the vibratory elements are moved into and out of contact with the penis by the person whose penis is being stimulated. Apparatus for carrying out the method is also disclosed.