Queefing during sex is caused by air getting pushed into the vaginal canal and then released. It’s completely normal, it’s not gas from your digestive system, and it happens to most people with vaginas at some point. Sex is actually one of the most common triggers.
How Air Gets Trapped During Sex
The vaginal canal isn’t a sealed tube. It’s a flexible, muscular space that can open and close slightly depending on your position, arousal level, and what’s happening physically. When a penis, finger, or sex toy moves in and out, it acts like a piston, pushing small pockets of air inside with each thrust. That air has nowhere to go until whatever entered the vagina pulls back or withdraws, at which point the trapped air escapes and makes the sound you hear.
This is purely mechanical. It has nothing to do with hygiene, arousal problems, or anything being “wrong” with your body. The sound is just air passing through a narrow opening, the same basic physics as letting air out of a balloon.
Why Certain Positions Make It Worse
Positions that tilt your pelvis or angle your hips tend to open the vaginal canal more, which lets more air slip in during penetration. Doggy style is a common culprit because your hips are elevated and your torso angles downward, creating a wider opening. Any position where there’s a lot of in-and-out motion, or where the penetrating partner pulls nearly all the way out before re-entering, increases the pumping effect that forces air inside.
Switching positions frequently can also trigger it. Each time you reposition, air can enter before penetration resumes. Even something as simple as shifting your legs wider apart can change the angle enough to let air in.
How Common It Really Is
Studies on vaginal flatus (the clinical term) suggest it affects somewhere between 13% and 20% of the general female population on a regular basis, depending on the population surveyed. Those numbers likely undercount the real frequency, since many people experience it occasionally during sex but wouldn’t report it as a recurring issue. If you’re noticing it, you’re far from alone.
Having given birth vaginally is one of the strongest risk factors for more frequent queefing. Pregnancy and delivery can stretch the pelvic floor muscles and vaginal tissues, which may allow air to enter more easily during sex and other physical activities. This doesn’t mean something is damaged. It means the tissues have changed shape slightly, which is a normal consequence of childbirth.
Pelvic Floor Strength Plays a Role
Your pelvic floor muscles wrap around the vaginal canal and help control how tightly it stays closed. When those muscles are weaker, whether from childbirth, aging, chronic straining, or simply not being very toned, the vaginal walls may not hold together as snugly. That creates more space for air to slip in during movement.
Strengthening your pelvic floor through Kegel exercises can help reduce how often it happens. Kegels involve repeatedly squeezing and releasing the same muscles you’d use to stop the flow of urine. Doing these consistently over several weeks builds tone in the vaginal walls, which can make the canal less likely to trap air during penetration. This won’t eliminate queefing entirely (nothing will, because the mechanics of sex naturally involve air displacement), but it can reduce the frequency.
Practical Ways to Reduce It
Beyond pelvic floor exercises, a few in-the-moment adjustments can help:
- Limit full withdrawal. The more your partner pulls out before thrusting back in, the more air gets pushed inside. Shorter, shallower strokes trap less air.
- Avoid frequent position changes. Each switch creates an opportunity for air to enter. Settling into one position for longer stretches reduces the pumping effect.
- Try positions with less pelvic tilt. Lying face-to-face or keeping your hips level rather than elevated tends to keep the vaginal opening narrower.
- Pause and reposition slowly. If you feel air building up, a brief pause where you press your legs together or shift your hips can let trapped air release more quietly before continuing.
None of these are guarantees. Queefing is a byproduct of the physics involved in penetrative sex, and trying to prevent it entirely can make you more self-conscious than the sound itself warrants.
When It Could Signal Something Else
In rare cases, persistent vaginal air or gas with a foul smell could indicate a rectovaginal fistula, which is an abnormal connection between the rectum and the vagina. This is uncommon and typically follows surgery, childbirth injury, or inflammatory bowel disease. The key differences from normal queefing are significant: a fistula usually causes foul-smelling vaginal discharge, stool leaking from the vagina, painful intercourse, pelvic pain, or rectal or vaginal bleeding.
If your queefing happens only during sex or exercise, has no odor, and isn’t accompanied by discharge or pain, it’s normal vaginal air and not a medical concern. If you notice any of those additional symptoms, that’s worth bringing up with a gynecologist, as a fistula requires specific imaging to diagnose and typically needs surgical repair.