Relax Anal Lube 4.4oz/130ml Desensitizing Spray Gel has the active ingredient of Lidocaine 3.5%. This means it provides relief from discomfort as Lidocaine prevents pain by blocking the signals at the nerve endings in the skin. Size: 4.4 fl. oz. 130ml. Anal play is exciting and sensual but with out the right lube and essentials it can turn back door play into pain.