![]() Typical water-based lubricants may be incompatible with sex acts that occur in water (such as in a bathtub, pool, or hot tub) as they can be dissolved or dispersed in water. ![]() Scientists are testing whether anti-retroviral lubricants or gels can be applied to aid in the prevention of transmission of HIV. ![]() This may require reapplication during sex, and/or removal of the residue with water. When the lubricant eventually dries out, it may leave behind a residue derived from the other ingredients in the formulation. Because water-based personal lubricants 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. The viscosity of these products can be altered by adjusting their water content and concentration of cellulose or other gel-forming hydrophilic ingredient. Products available today may have various agents added for even dispersal, moisture retention, and resistance to contamination. The earliest water-based lubricants were cellulose ether or glycerin solutions. Water-based personal lubricants are water- soluble and are the most widely used personal lubricants.
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