Whether you’re brand new to butt stuff or backdoor play is already part of your sexual repertoire, anal sex is generally the kind of sex act you want to prepare for—particularly if you’re planning on engaging in anything penetrative (as opposed to external forms of anal play like rimming).
There are a few reasons anal sex may benefit from more advance prep than other kinds of sex acts. For one thing, unlike the vagina, the anus does not self-lubricate or naturally expand to allow for penetration when aroused. And then, of course, there are the additional hygiene (read: poop-related) concerns that come with the territory.
More, here.
