Water-based personal lubricants are water-soluble and are the most widely used personal lubricants. Because they absorb into the skin and evaporate, most water-based lubricants have a tendency to dry out during use, but reapplication of the lubricant or application of water or saliva is usually sufficient to reactivate them. When the lubricant eventually dries out, it may leave behind a residue derived from the other ingredients in the formulation. This may require reapplication during sex, and/or removal of the residue with water. Some newer water-based lubricants are formulated with natural skin moisturizers, such as carrageenan, and may not leave a sticky residue after evaporation.