(Basically what Neato has said.)
Motions of what's entering the anus will determine the air being shoved into it. If females can queef from mutual masturbation and sex, then air can also be packed into an anus this way. One way to avoid this is not to make full motions. Avoid pulling out all or almost all of the way before thrusting again. When you pull out, usually an orifice is molded in the shape of whatever was just inserted, then when you thrust back in, this opening is sealed off with the object again, creating a bubble of air. Somehow, that air will eventually get out.
Farting after anal sex is just like queefing.
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Just Google It.
BA Psychology & Photography
(I'm not going psychoanalyze you nor will I let you cry on my shoulder. Have a nice day.)
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