Personal lubricants

Personal lubricants are specialized lubricants which serve to reduce friction with the vagina, the anus, or other body parts. Personal lubricants were originally derived from surgical lubricants designed for use during medical procedures, but are now also used frequently to provide lubrication for sexual practices. Some of these lubricants are scented and/or flavoured. For example, some lubricants may have the scent/flavour of apple or cinnamon.

Lubricant types

Water-based
Water-based personal lubricants are water soluble and are the most widely available personal lubricant on the market. The earliest water-based lubricants were cellulose or glycerin solutions. Lubricants containing glycerin may cause or exacerbate vaginal yeast infections in persons who are susceptible. [1] [2] [3] Subsequent products have added various agents for spreading, water retention, and resistance to contamination. The viscosity of these products can be adjusted by adjusting their water content and concentration of cellulose (or another gel-forming hydrophilic ingredient). They have a tendency to dry out during use, but reapplication is often sufficient to re-activate them.
Because water-based personal lubricants absorb into the skin they can quickly dry out leaving the residue derived from the other ingredients in the formulation. Particularly sugar (or glycerin) and other chemicals and preservatives create a sticky residue and associated sensation, often associated with an unpleasant taste and smell. Water based personal lubricants require constant reapplication and leave a residue on the skin which however is easily removed with water.
Typical water-based lubricants are incompatible with many sex acts that occur in water (such as in a bathtub or hot tub) as they can be dissolved or dispersed in water. About J-Lube this author states, "It will even stay on skin for quite a while under a constant stream of water, such as a shower or even underwater in a bath." [4]
Popular personal lubricant brands include Yes, K-Y Jelly, Astroglide, EROS, Firefly, ID Lubricants, ForPlay / 510k approved, SLIP / 510k approved, PrePair / 510k approved, O'My, Sliquid, Durex PLAY, Maxoderm Connection, Triesco, and Ready lube.

J-Lube
One of the least expensive lubricants is a concentrate known as J-Lube. It is used as a veterinary lubricant and special-effects slime ingredient. J-Lube is sometimes used as a sexual lubricant, especially in some sexual sub-communities. It is usually purchased as a powder, which consists of polyethylene oxide mixed with sucrose as a dispersing agent, and produces an extremely slippery lubricant when mixed with water.

Oil-based
Unlike water-based lubricants, oil-based lubricants, such as Vaseline, dissolve latex and are likely to reduce the effectiveness of latex condoms as a contraceptive and protection against sexually transmitted diseases. These synthetic oil-based lubricants (made from crude oil - hence the names Petroleum and mineral oil) should never be used for either anal sex or vaginal sex, as the synthetic oil may coat the lining of the opening, providing a haven for bacterial infection [citation needed]. (Synthetic oil-based lubricants can only safely be used for anal sex if the participants are STD-negative; even then, condom-protected sex may not be "safe sex" for days afterwards, as the oil-based lubricant has a tendency to linger in the anus.)
Although petroleum jelly (e.g. Vaseline) is inexpensive and readily available, it can often be difficult to clean off the body after sexual activity, due to the fact that it is not water soluble and coats the skin. Clear, bottled mineral oil (commonly used as an oral laxative), or baby oil, is a less viscous alternative to petroleum jelly and is easier to wash off the skin. These are still synthetic petroleum based products and can cause skin irritation. link title

Plant-based oils
One might also consider a vegetable oil like rice bran oil or coconut oil, if the aroma is amenable to the persons involved. The smell of olive oil may be preferred. Improvised lubricants may cultivate pathogens, especially if used as foods. More details are in other sections.
Medicinal Castor oil was the original plant-based surgical lubricant.[1]
Many other natural plant-based fats, such as Coconut oil or Cocoa butter, may be used as well. Yes oil-based is the natural alternative to both synthetic petroluem based lubricants and silicone lubricants

Silicone-based
Silicone-based lubricants posses many unique qualities which make them very different to other personal lubricants. Silicone based personal lubricants do not absorb into the skin, instead staying on the surface of the skin to provide a durable glide. Various products have variying characteristics, quality and performance.
The first silicone-based personal lubricant was developed by Megasol GmBH in Germany 1994 and is now recognised internationally. EROS was the first to be tested and certified for latex compatability. It is known as the 'Rolls Royce" of personal lubricants because of its silky smooth texture which is sugar, oil, fat, fragrance and paraben free. Because EROS does not have the preding ingredients, which often cause irritations, it is dermatalogically tested and hypoallergenic and does not block the pores. EROS has a long lasting durable glide which reduces the need to reapply while leaving skin feeling soft silky and moisturised.
Not all silicone-based lubricants are certified condom and latex safe, always check the lable and use as directed.
Silicone based personal lubricants come in a variety of consistencies.
Silicone-based lubricants are not recommended to use with silicone-based sex toys. The lubricants dissolve the surface of the toys, making them sticky and causing them to slowly disintegrate. Pre-lubricated condoms may use a silicone lubricant and should therefore check before using with silicone-based sex toy.
Popular brands include KY Intrigue, ID Millennium, Eros, Eros Essentials, Sliquid Silver, Wet Platinum, DeGLOW, and Liquid Silk.

Specialty lubricants
"Specialty" lubricants are designed to cause physiological or physical changes to the area applied; these include warming lubricants, which cause a heating sensation in the skin. Breathing on these types of lubricants can increase the effect. Another type of specialty lubricant can increase blood flow to the regions in which they are applied, creating a fuller erection of the penis or clitoris; these may contain vasodilators to theoretically increase blood flow after topical application, products that include L-Arginine can cause herpes outbreaks. Others include flavored lubricants.
Popular brands include ID Lubricants, Firefly Natural Lubricant, Wet fun flavors, O'My, Sliquid, KY Jelly (warming lubricant), and Thermal warming lubricant (with the vasodilator L-arginine).
Medicine
In medicine, personal lubricants such as K-Y Jelly or Astroglide can be used for gynecological examinations, digital rectal examinations, and in the use of enema nozzles and rectal thermometers. In fact, some personal lubricants were invented for these medical uses.

Sexual intercourse
A lubricant can be used to increase pleasure or reduce pain during sexual activity and may be used for lubricating the penis or dildo or the vagina or anus before sexual intercourse. Personal lubricants can make bearable and even pleasurable acts of sexual intercourse that could otherwise be painful, such as anal sex, or vaginal intercourse when the woman experiences vaginal dryness or her vagina is contracted. It is generally sufficient to apply a good drop of gel on the vaginal entrance; anal sex usually requires a more generous application, since the anus has no natural lubrication. There are also available combinations of personal lubricants with spermicides, to be injected into the vagina prior to intercourse. Although the pleasure is not long lasting, lubricants increase stimulation. The pleasure may last long if you keep applying the lubricant.

Masturbation
Males and females masturbate differently. While males do produce a lubricating fluid (Cowper's fluid), the informal name for this fluid, "pre-come" or "pre-cum", already indicates that this may often be released only relatively shortly before orgasm or after intense manual stimulation. The use of lubricant is particularly common for circumcised men. A lubricant may be used to facilitate the use of certain sex toys, or with females as part of prolonged clitoral stimulation.

Dry penis masturbation
A small amount of moisture tends to make skin stickier and weaker. Occasionally the skin of the hand may peel from masturbation (and other stresses). Rather than using a fluid lubricant to masturbate the penis, some use dry masturbation techniques aided by: tissue, soft/silky fabrics, (edible) powders, or sex toys.

Massage
Cooking oils are popular for massage because they are inexpensive and don't dry out; olive oil, for example. Safflower oil has a nutty aroma some like more than others. Cooking oils may irritate the skin. Planning may be necessary to keep oil off latex condoms and sex toys, and absorptive furniture. A male or female condom made of polyurethane should not be harmed by oil. Also dry penis masturbation can cause redness and irritate the penis, and also can cause the penis to become sore. Lubrication is recommended, a classic example is you cannot operate a car or motorcycle without lubrication. Even our joints in our bodies have natural lubrication.