XR Brands Clean Stream Desensitizing Anal Lube. Relax Anal Lubricant is a desensitizing lube that can help ease some of the potential discomfort associated with anal play. This silky smooth liquid keeps unwanted friction at bay, and offers a light numbing effect to help keep things comfortable during backdoor exploration. Size: 4 ounces. Active Ingredient: 2.0% Lidocaine.