A lubricant, or lube, is a substance that helps to reduce friction between surfaces in mutual contact, which ultimately reduces the heat generated when the surfaces move. It may also have the function of transmitting forces, transporting foreign particles, or heating or cooling the surfaces. The property of reducing friction is known as lubricity. Lubricants have been in use for thousands of years, with calcium soaps identified on the axles of chariots dated to 1400 BC.
In addition to industrial applications, lubricants are used for many other purposes, including cooking (oils and fats in use in frying pans, in baking to prevent food sticking), bioapplications on humans (e.g., lubricants for artificial joints), ultrasound examination, medical examination, and sexual intercourse. During sexual arousal, a woman’s vagina typically becomes lubricated, making it wetter and ready for sex. However, sometimes women experience vaginal dryness, leading to pain or discomfort. In these circumstances, a lubricant can help. There are several types of lubricants, each with advantages and disadvantages. Water-based ones are good for sensitive skin, while silicone and oil-based ones last longer but can damage toys and condoms. Natural options like olive oil can be used but also come with potential risks.
