WAVE is the thicker water-based formula, making it ideal for anyone who wants something that stays on the surface of the skin longer, or may be using it for anal play.The EROSENSE Line was created for people who are looking for healthier choices when it comes to their sexual wellness products. All of our healthy formulas include a combination of natural, organic, food-grade, eco-cert, and EU Certified ingredients. They are all glycerin and paraben-fre, and pH balanced to work perfectly with a womans body. EROSENSE is a perfect choice for anyone, and the best choice for those will allergies and sensitivities.