Lubricants are generally applied to the outside of the vagina for use. Lubricants have a lubricating effect and are mainly used as a medium to reduce frictional resistance and increase the degree of lubrication. Lubricants are usually used by women with low secretion, menopausal women, and older women whose vaginal dryness causes painful friction during sex, so they can increase the level of lubrication, relieve the pain caused by vaginal dryness, and improve the quality of sex between couples. Lubricants can be applied evenly to the vaginal opening and should not be applied to the inside of the vagina. Applying lubricant to the vaginal opening can increase lubrication and reduce the pain caused by friction during sex; secondly, lubricant can also be applied to condoms, or applied directly to the male genitals. Lubricant should be used in the right amount, not too much, in the process of use, any discomfort is recommended to go to the hospital in a timely manner, in accordance with the doctor’s instructions to deal with the treatment.