Abstract: A vasodilator delivery system is provided for producing and maintaining the erection of a male penis during intercourse. The vasodilator is contained in a transdermal patch. The transdermal patch comprises a thin, smooth-edged layered structure for dispensing a suitable vasodilator to the penis skin surface. In each embodiment of the patch, a vasodilator is applied to the skin of the user and is sealed against unwanted contraindicated leakage and contact with the internal tissues of a sex partner.