Oral sex is a sexual activity where the sexpartners stimulate the genitalia of a man or woman by using the mouth (tongue, lips, sometimes even teeth or throat). Instructions for use: Use liner to outline lips from corner to cupids bow and then heart of lips to corners, applying multiple layers to build intensity g/ oz. When using both ends, the result is a sensual ombre effect. % Authentic (#7 Secret Escort - pinkish red). | eBay!.