Lubricant is a MUST for any kind of anal play. Many lubricants are safe for anal sex, but there are products that are specifically designed to enhance enjoyment of anal sex. Often, this is simply a thicker gel rather than a liquid. This thicker consistency is preferable because it helps the lubricant stay in place. Some anal lubricants contain benzocaine, a numbing agent that will numb the anal area for a more comfortable experience for anal sex, but should be used with care as a lack of sensation makes accidental injury.