Anal play sans lube can not only be painful, it can also cause some mild bleeding afterward due to any anal tears in the sensitive anal canal tissue. Lubes generally fall into one of three categories: water, silicone, or oil-based. Each have their bennies and drawbacks. Water-based, while not as slick or long-lasting as silicone or oil-based, is safe for use with condoms and toys. Lube that makes butt stuff less painful sounds too good to be true, because it is.
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For anal sex, this is the best lube. These lubes almost invariably include numbing agents, which are pretty much the last thing that you want in your lube, aside from sand or Icy-Hot. Reducing sensitivity will lead to injury because you can't tell when things are going wrong. Pain is a warning… if it hurts, you need to stop.
Assuming you and your partner have butt sex on the menu in general and both enjoy it, using olive oil or goose grease, mayonnaise, crisco, lard, ghee, tallow, margarine or fish liver oil is probably significantly more ass-friendly than using nothing at all. A group of enthusiastic fuckers I used to know used olive oil with a little gardenia essential oil added to it for any kind of fucking imaginable. They used a lot of it. Still get a kind of ookie feeling when I smell gardenias.