Extra Strength Relax Anal Gel Lubricant Desensitizing Spray 4 oz. This extra strength formula has plenty of the powerful ingredient shown to prevent premature ejaculation, providing temporary male genital desensitization, and prolonging intercourse. It is also great as an anal lubricant, providing relief from any discomfort. Just apply where needed, and you are ready for a full night of breathless passion. Size 4 fluid ounces. Active Ingredient: Benzocaine UPS 3.5 percent.