Using your Tenga Dual Hole Masturbation Cup is easy. First, make sure your hands are clean. You can add some water-based lubricant to the inside of the cup for a smoother experience. Then, choose either the 'Bitter Side' for deep stimulation or the 'Sweet Side' for gentle suction and insert yourself. Move in and out at your own pace to enjoy the different sensations. When you're done, clean the cup thoroughly with mild soap and warm water. Rinse it well to make sure no soap residue is left. Let it dry completely before storing it in a cool, dry place. Avoid using oil-based lubricants as they can damage the TPE insert sleeve. Also, don't expose the cup to direct sunlight or high temperatures for a long time as it can affect the materials.