Carrageenan has also been shown to be a potent inhibitor of human papillomavirus infection. Often, this is simply a thicker gel rather than a liquid. ANSI and NSF have partnered with organic certifiers around the country in order to provide a definitive set of compliance guidelines for organic lubricants and other personal care products. The Population Council , in a study, tested commercially available water-based sexual lubricants, and found that many damaged human rectal cells and that some of them - those containing polyquaternium - appeared to actively increase HIV replication in cell cultures and therefore could raise one's risk of HIV transmission. Because of strict FDA guidelines for medical devices, organic personal lubricants were no longer allowed to carry a USDA seal for Nude Personal Lubricant, and that it should be very careful about using the term organic anywhere on its label. Personal lubricants are particularly useful for intercourse when a partner experiences dryness or excessive contraction tightness of the vagina or anus.
Commonly used lubricants include saliva , oil such as baby oil, olive oil , canola oil , or mineral oil or commercially available lubricants that are either water-based or hydroxyethylcellulose-based. Many men in Japan use lubricant created specifically for onaholes such as the Tenga Egg. Other[ edit ] Other products that have been used as personal lubricants include vegetable shortening , which is durable and inexpensive but damaging to latex. In most cases, a warning is listed on the product label. Personal lubricants are particularly useful for intercourse when a partner experiences dryness or excessive contraction tightness of the vagina or anus. Products available today may have various agents added for even dispersal, moisture retention, and resistance to contamination. ANSI and NSF have partnered with organic certifiers around the country in order to provide a definitive set of compliance guidelines for organic lubricants and other personal care products. Silicone lubricants offer a different feel from water-based personal lubricants. Water-based[ edit ] Water-based personal lubricants are water- soluble and are the most widely used personal lubricants. During fertility interventions, the use of a lubricant eases sperm specimen collection by masturbation. 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. Many of these types of lubricants also market themselves as "natural" and do not contain paraben, glycerin, DEA or animal-based ingredients. Some anal lubricants contain numbing agents to relieve discomfort during anal sex, although it is generally inadvisable as a lack of sensation makes accidental injury more likely. Scientists are testing whether anti-retroviral lubricants or gels can be applied to aid in the prevention of transmission of HIV. Silicone-based[ edit ] Silicone -based lubricants are usually formulated with fewer than four ingredients and do not contain any water. Not all silicone-based lubricants are certified latex-safe, but silicone-based lubricants have not been shown to increase the risk of HIV transmission during anal intercourse , as some water-based lubes have. Some contain botanicals such as aloe vera or plant extracts. Silicone-based lubricant is also used in the manufacture of pre-lubricated condoms, due to its long-lasting properties and superior latex compatibility. Some lubricants are conveniently packaged for ease of application. Carrageenan has also been shown to be a potent inhibitor of human papillomavirus infection. When the lubricant eventually dries out, it may leave behind a residue derived from the other ingredients in the formulation. Some newer water-based lubricants are formulated with natural skin moisturizers, such as carrageenan , and may not leave a sticky residue after evaporation. Their certification process calls for transparency in the ingredients used and the processes utilized to turn those ingredients into finished products. The viscosity of these products can be altered by adjusting their water content and concentration of cellulose or other gel-forming hydrophilic ingredient. Many different silicone lubricants are commercially available, with varying quality and performance. Vaginal lubricants[ edit ] Vaginal lubricants are used to reduce vaginal dryness and pain during intercourse, and by couples trying to conceive. Silicone-based lubricants are not absorbed by skin or mucous membranes and consequently last longer than water-based lubricants.
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