How can you make anal sex easier to do?

Anal sex is difficult to perform because it is unnatural. If we were meant to be sticking things in our behinds, don't you think it would be less painful?
Anyway, there are only two real ways that you can make it easier to perform sodomy, and that is as the young lady mentioned on the answer above, lubrication ... And the other method is regular anal intercourse as this will loosen that orifice, as is the case with pornographic film actors and actresses.