Self lubricating condoms might make people actually want to use them 12 Reasons to Use Condoms or Other Barriers: Low Risk, Access, More FAQ Friday: Unlike the traditional (male external condom), which is worn on the outside of the penis during sex, the internal (female) condom is worn inside the vagina as a barrier to prevent Oil based lube can cause some condom materials to break. Always use water based or silicone lube to avoid a condom KO