Squirting happens when fluid is expelled from the urethra during sexual arousal or orgasm, typically in response to stimulation of the front vaginal wall. The volume can range from a small amount to several hundred milliliters, and the process involves a combination of glandular secretion, bladder activity, and involuntary muscle contractions. Despite its popularity in porn and persistent confusion online, the physiology is now reasonably well understood.
Squirting and Ejaculation Are Two Different Things
One of the biggest sources of confusion is that “squirting” and “female ejaculation” are often used interchangeably, but they’re distinct processes that can happen separately or at the same time.
Female ejaculation is the release of about 1 milliliter of thick, whitish fluid from the Skene’s glands (sometimes called the female prostate), two small glands that sit on either side of the urethral opening. This fluid contains prostate-specific antigen (PSA), fructose, and glucose, giving it a composition surprisingly similar to male seminal fluid. It’s a glandular secretion, not urine.
Squirting is the release of a much larger volume of clear fluid from the urethra, sometimes tens to hundreds of milliliters. This fluid originates in the bladder and contains urea, creatinine, and uric acid, the same markers found in urine. However, squirting fluid can also contain small amounts of PSA and glucose, which suggests that some Skene’s gland secretion mixes in during the process. So while squirting is primarily dilute, modified urine, it’s not simply “peeing.” The fluid composition is chemically different from regular urine, and the mechanism that triggers its release is tied to arousal and orgasm, not to the normal urge to urinate.
Where the Fluid Comes From
Ultrasound studies have mapped exactly what happens inside the body before, during, and after squirting. In one well-known study, women emptied their bladders completely, which was confirmed by pelvic ultrasound. During sexual stimulation, a second scan showed noticeable bladder refilling. After squirting, a third scan showed the bladder had emptied again. The bladder fills rapidly during arousal, sometimes in just minutes, and empties during the expulsion.
A separate experiment confirmed this even more directly. Researchers inserted a urethral catheter, emptied the bladder, then injected blue dye mixed with saline into the bladder before sexual stimulation began. When the women squirted, the expelled fluid was blue in every case, confirming the bladder as the source.
The Skene’s glands contribute a smaller but biochemically distinct component. These glands swell during arousal and secrete fluid that travels through tiny ducts into the urethra. The milky ejaculate they produce is what gets mixed into squirting fluid, which is why chemical analysis picks up both bladder markers and prostatic markers in the same sample.
The Role of the G-Spot
Most women who squirt report that it happens during stimulation of the anterior (front) vaginal wall, the area commonly called the G-spot. This isn’t a single anatomical structure like a button. It’s a region where the vaginal wall sits close to the internal anatomy of the clitoris, the urethra, and the Skene’s glands, creating a zone that’s especially responsive to pressure.
In one early clinical case study, a woman had a particularly firm, erotically sensitive area on the front wall of her vagina, roughly 2 centimeters by 1.5 centimeters. When stimulated, this area swelled by up to 50 percent. She initially felt an urge to urinate, which then shifted to pleasure as stimulation continued. She only experienced fluid expulsion when she reached orgasm through direct stimulation of that spot. That initial “need to pee” sensation is something many women report, and it likely reflects the pressure being placed on the urethra and the rapidly filling bladder from the other side of the vaginal wall.
What Happens in the Body During Orgasm
The expulsion of fluid is driven by the same involuntary muscle contractions that occur during orgasm. When arousal reaches a threshold, the spinal cord sends a burst of nerve signals that trigger rhythmic contractions in the pelvic floor muscles. Two muscle groups are especially relevant: the muscles overlying the clitoral legs and the muscles surrounding the vaginal opening and urethral area. These contractions can push fluid out of the urethra from both the bladder and the Skene’s glands simultaneously.
Not every instance of squirting happens at the exact moment of orgasm. Some women expel fluid during high arousal before orgasm, and some experience it after. But the underlying mechanism is the same: sufficient engorgement of the tissue surrounding the urethra, rapid bladder filling during arousal, and strong pelvic muscle contractions that force the fluid out.
How Common Squirting Actually Is
Survey data on prevalence varies widely depending on how the question is asked. In one population-based survey, 54 percent of 233 women reported a spurt of fluid at orgasm. A larger mail survey of 1,172 women found that about 40 percent identified as having experienced ejaculation. On the low end, one study of 300 women found only about 5 percent reported it. The wide range reflects differences in definitions, awareness, and willingness to report, not necessarily differences in biology.
Skene’s glands vary significantly in size from person to person, and some women have very small or even undetectable glands. This anatomical variation likely explains why some women produce noticeable fluid and others don’t, regardless of technique or arousal level. It’s a normal variation, not a skill to be unlocked or a problem to be solved.
Why It Gets Confused With Incontinence
Because squirting fluid comes partly from the bladder, it’s reasonable to ask whether it’s just urinary incontinence during sex. The International Continence Society recognizes this as an important distinction. Coital urinary incontinence is an involuntary loss of urine during penetration or orgasm, often associated with pelvic floor disorders. Squirting and female ejaculation, by contrast, are physiological responses to high arousal.
The key differences are context and composition. Squirting fluid is chemically diluted compared to regular urine and contains prostatic markers that wouldn’t be present in simple incontinence. It also correlates with arousal level rather than with known risk factors for incontinence like pelvic organ prolapse or weakened pelvic floor muscles. Both phenomena can look similar from the outside, but they have different causes. Fluid expelled during sex can originate from the vagina, the bladder, the Skene’s glands, or a combination of all three, and figuring out which is happening matters if incontinence is a concern.