Thursday, August 23, 2012

Lubricating gel

Personal lubricant types - Lubricating gel

Water-based

Water-based personal lubricants are water-soluble and are the most widely-used personal lubricants. The earliest water-based lubricants were cellulose ether or glycerin solutions. Products available today may have various agents added for even dispersal, moisture retention, and resistance to contamination. The viscosity of these products can be altered by adjusting their water content and concentration of cellulose or other gel-forming hydrophilic ingredient.
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. 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. Carrageenan has also been shown to be a potent inhibitor of human papillomavirus infection. Carraguard, an aqueous gel containing carrageenan developed as a microbicide, has been shown in some preliminary studies to inhibit HIV transmission, although results have been mixed. Scientists are testing whether anti-retroviral lubricants or gels can be applied to aid in the prevention of transmission of HIV.
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.
A 2011 study by the Population Council found that many commercially-available water-based sexual lubricants tested damaged human rectal cells and that some of them - those containing polyquaternium-15 - appeared to actively increase HIV replication in cell cultures and therefore could raise one's risk of HIV transmission. Water-based ‘lubes’ have been recommended for use in safer sex because they do not weaken condoms like oil-based lubricants do. The researchers concluded: "Since it is the condom that is protecting users from HIV rather than the lube, condom users should still be encouraged to use water-based lubes because condoms are also more likely to break, and trauma to the rectal lining occur, with no lube". They also cited silicone-based lubricants as a potential alternative, although they did not test any silicone lubes in their study.[3] Lubricants and creams containing the spermicide nonoxynol-9 are known to be cytotoxic, as studies have shown the compound damages cells and makes users more vulnerable to HIV.

Oil-based

Oil-based lubricants, for example petroleum-based lubricants (such as petroleum jelly), can increase the likelihood of breakage and slipping of latex condoms due to loss of elasticity caused by these lubricants.[4] Oil may also create tiny holes in the latex. Oil-based lubricants may be considered desirable for people who are in relationships not requiring condom use and who wish to avoid certain additives and preservatives often found in other lubricants.

Fertility lubricants

Fertility lubricants, also known as 'sperm-friendly' lubricants, are specifically formulated to be safe for use by couples who are trying to conceive. Fertility lubricants are pH-balanced and designed not to affect the body's electrolyte balance. They have a specific osmolality range that is safe for sperm. In addition to having the correct pH and osmolality range, fertility lubricants should be free of chemicals that can potentially harm sperm. Fertility lubricants are non-spermicidal and do not harm viability or motility of human sperm.
A lubricant that contains calcium (Ca2+) and magnesium (Mg2+) ions and has an optimal pH and osmolality range better mimics the natural fertile cervical fluids to alleviate the problem of vaginal dryness and to assist couples trying to conceive a baby naturally. The ASRM has published data on at least one fertility lubricant containing calcium and magnesium as safe for use when trying to become pregnant.
For couples trying to conceive, it is important to choose a lubricant carefully. Most personal lubricants, including saliva or water, may potentially damage sperm and keep them from swimming normally, and therefore are not recommended for use if pregnancy is the objective.

Organic or natural

In the United States, the first certified organic personal lubricant labeled with the USDA organic seal was Nude Personal Lubricant,[10] which was created in 2004 by Applied Organics. The US Food and Drug Administration (FDA) regulates lubricant as a medical device rather than as a cosmetic. Because of strict FDA guidelines for medical devices, Buddy Morel said his company was told its product could not carry a USDA seal for Nude Personal Lubricant, and that it should be very careful about using the term organic anywhere on its label. However, many personal lubricants today market themselves as "organic", such as Yes, which is certified organic,[11] Intimate Organics,[12] and Sliquid[13]. Many of these types of lubricants also market themselves as "natural" and do not contain paraben, glycerin, DEA or animal-based ingredients. Some contain botanicals such as aloe vera or plant extracts.

Silicone-based

Silicone-based lubricants are usually formulated with fewer than four ingredients and do not contain any water. Silicone lubricants offer a different feel from water-based personal lubricants. Silicone-based lubricants are not absorbed by skin or mucus membranes, and consequently last longer than water-based lubricants. Many different silicone lubricants are commercially available with varying quality and performance. 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.
Silicone-based lubricants are not usually recommended for use with sex toys or other products that are made from silicone because the formula may dissolve the surface making it sticky to the touch, and cause disintegration of the item over time. This damage may create a breeding ground for bacteria. In most cases a warning is listed on the product label. At least one manufacturer claims their silicone-based lubricant is safe for use with silicone products. Silicone-based lubricant is also used in the manufacture of pre-lubricated condoms, due to its long-lasting properties and superior latex compatibility.

Speciality lubricants

Warming lubricants contain specific ingredients to cause a sensation of warmth. Breathing on these types of lubricants may increase the effect. "Cooling" or "tingling" lubricants may contain ingredients such as peppermint. Some lubricants are sold together, such as "hot and cold", or are marketed for a specific use or effect.[15] Flavored lubricants contain flavorings, such as fruit flavors, to enhance oral contact. "Edible" lubricants may be flavored and/or may not contain any ingredients that are not advisable to eat.[16]

Anal-specific

Many lubricants are safe for anal sex, but there are products that are specifically marketed or designed to enhance enjoyment of anal sex. Often, this is simply a thicker gel rather than a liquid. This thicker consistency is preferable because it helps the lubricant stay in place. Some lubricants contain benzocaine, an anesthetic. However, the use of any numbing agent for anal penetration is not recommended as a lack of sensation makes accidental injury more likely. In addition, benzocaine can cause an allergic reaction in those with an allergy to PABA (4-Aminobenzoic acid). Some lubricants are conveniently packaged for ease of application. Many of these products such as Astroglide Shooters have been pulled from the market recently due to FDA Medical Device Requirements. Products containing benzocaine can numb all body parts with which they come in contact.[17]

Male masturbation-specific

Some lubricants are designed specifically for male masturbation. Many of these are lipid-based for durability and quality of sensation at the expense of latex compatibility. By applying them to the penis, these lubricants can increase the pleasure of masturbation.[citation needed]

Other

Other products that have been used as personal lubricants include vegetable shortening, which is durable and inexpensive but damaging to latex.[18] In a controversial scene in the movie Last Tango in Paris, the character Paul, played by Marlon Brando, uses butter during anal sex with the character Jeanne played by Maria Schneider.
Preprinted with permission of www.private-shades and inconjunction with Wikipedia

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