Silicone lube is the second most commonly used lubricant. It is a popular alternative to water-based lubricant and lacks many of the problems faced with water-based lubricants. Silicone lubricant is considered safe.
Silicone lubricant is extra slippery. It remains slippery longer, needing less reapplications. It will typically last the duration of any sex encounter. Silicone lubricant remains slippery under water, making it an excellent choice for sex in hot tubs, sex in bathtubs, in swimming pools, a lake, ocean, anywhere that is under water. Silicone is considered safer for the vagina if yeast infections are a problem, as water-based lubricants tend to give yeast what it needs to grow, whereas silicone lubricant does not. Silicone is a healthy personal lubricant, in that it does not contain many of the risks associated with other types of lube (for example, water-based being associated with yeast infections, oil-based and petroleum being a skin irritant to some).
Silicone is completely inert, meaning it does not react badly with the body in any way. Silicone does not react with your digestive tract whatsoever, and though there are no edible silicone lubricants, some are flavored. There are many medical uses of silicone which involve insertion into the body, including lubricating hypodermic needles and as an aid in the insemination process when a fertility clinic is inserting a baby, because it does not interfere with a woman’s uterous’ health or disturb the egg. Oral sex with silicone lubricant residue still on the vagina or penis is completely safe.
Silicone tends to be more expensive. It is far more difficult to clean off skin, and nearly impossible to get out of clothing, fabric bedsheets or cloth furniture. Silicone does not mix with water whatsoever. This is an advantage while having underwater sex, but it is a disadvantage when trying to wash off in water. Silicone lubricant can ruin silicone-based sex toys, so if you are lubricating your sex toy — do not use silicone lubricant.