Anyone who is giving any advice about anal sex will give this tip. "Lube. Lube, lube, lube, and go slow," says Stubbs. Again, the anus does not lubricate naturally, like the vagina. This means people need a little outside assistance to get things going. People have their own preferences but Stubbs recommends silicon lube because it's thick and lasts a long time. When in doubt, add more lube. This may also mean adding more once sex is already well under way.