NO! Please do NOT use numbing agents on the anus!! I sell Anal Ease (Anal Eze), and I recommend using it AFTER anal sex, not prior to. If enough lube and patience are employed, and communication (if there is another partner present) anal sex can be fun and feel great! Numbing the area first denies the pleasure and could be dangerous, since our pain receptors are there to tell us something is wrong. This is also why I counsel folks to do plenty of self-play first to know what's normal for themselves. Refrain from using any drugs that affect sensation (especially alcohol) before anal sex, too. Afterwards, if you see a little bit of bleeding, that's pretty normal. The rectum has a rich nerve and blood supply, so any microtears will repair themselves very quickly. Check out puckerup.com - Tristan Taormino has written very coherently about anal sex for women (and has a book called Anal Sex for Women!).