A queef is the colloquial term for an emission of air during or after sexual activities. The sound is somewhat comparable to flatulence from the anus. The sound is most often associated with air expelled during or after vaginal intercourse but can also happen during fellatio or anal sex.

The occurrence after intercourse appears to be due to the decrease in the size of the vagina as it returns to a quiescent state when arousal ends.

If this is undesirable, the chances of this occurring can be minimized: for vaginal intercourse, the outward pushing Kegel exercise can reduce the chance of it happening, as well as avoidance of sexual positions where the woman raises her hips and thighs (such as when raising the legs over the shoulder of her partner while lying on her back), avoiding having the outward stroke completely leave the vagina and let air in, as well as using sexual lubricants which help to form a tight seal during the inward strokes.

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