Anal hole

Watching a porno yesterday, I saw a guy withdraw his penis all the way and the annus stayed open after withdrawal. How long does it stay in the open position ?

Have no idea. Depends upon how talented you are. In John Water's pivotal film, Pink Flamingos, (everyone should see the whole thing once) there is a guy who puffs on a cigarette with his ass and blows smoke. Truly a talent I'm certain the actor's mother was proud of.

It's called gaping, and is very common in the porn world (in straight porn atleast)

For gaping to haping the ass must have been fucked for a long time (with a fairly big toy or penis) so that the sphincter is relaxed and stretched out, otherwise the sphincter will close right away.

Do you wanna try gaping yourself?