Squirting fluid comes from the bladder and shares key chemical markers with urine, but calling it “just pee” misses important details. Biochemical studies consistently find that the fluid contains urea, creatinine, and uric acid at concentrations resembling diluted urine, yet it also frequently contains prostate-specific antigen (PSA), a substance produced by small glands surrounding the urethra that has nothing to do with the urinary system. The honest answer is that squirting is a real physiological event involving a modified form of very dilute urine mixed with prostatic secretions, and the science behind it is more interesting than either side of the internet debate usually lets on.
What the Chemistry Actually Shows
The most widely cited study on squirting’s composition was published in 2015 by a French team that used pelvic ultrasound and biochemical analysis on seven women who reported regular, high-volume squirting. They collected urine samples before sexual stimulation, collected the squirting fluid itself, and then collected urine again afterward. The squirting fluid had urea, creatinine, and uric acid concentrations comparable to what was found in the urine samples. But there was a twist: PSA, which was absent from the pre-stimulation urine in six of seven women, showed up in the squirting fluid of five of them.1PubMed. Nature and origin of “squirting” in female sexuality That means the fluid picked up a non-urinary component somewhere along the way, and the most likely source is the cluster of glandular tissue around the urethra.
An earlier case study of a single woman who could produce both a large-volume squirting fluid and a smaller, thicker secretion found the same split. The high-volume fluid had the density and chemical profile of diluted urine. The smaller secretion contained PSA at concentrations comparable to components found in male semen.2The Journal of Sexual Medicine. New Insights from One Case of Female Ejaculation These findings point to the same conclusion: the bulk liquid is bladder-derived, but it gets mixed with prostatic secretions on its way out.
Squirting and Female Ejaculation Are Not the Same Thing
One of the biggest sources of confusion in public discussions is that people use “squirting” and “female ejaculation” interchangeably. Researchers treat them as two distinct phenomena that can occur separately or at the same time. Female ejaculation refers to a small volume of thick, whitish fluid secreted by the periurethral glands (often called Skene’s glands or the female prostate) during orgasm. This fluid is rich in PSA and has little in common with urine. Squirting, by contrast, involves a much larger volume of watery fluid expelled through the urethra, and its chemical profile is that of very dilute urine with variable amounts of PSA mixed in.3PubMed. Differential diagnostics of female “sexual” fluids: a narrative review
A systematic review that examined the clinical literature on both phenomena concluded that the expulsion during orgasm manifests either as a smaller quantity of whitish secretion from the female prostate (ejaculation) or as a larger amount of diluted, chemically altered urine (squirting).4PubMed. Female ejaculation orgasm vs. coital incontinence: a systematic review In practice, many women who squirt are probably producing both fluids simultaneously, which is part of why the composition varies from person to person and even from one occasion to the next. When someone asks “is it pee?”, the answer depends partly on which fluid they’re asking about. The ejaculatory component is clearly not urine. The squirting component is mostly bladder-derived but altered enough that researchers resist calling it simple urinary incontinence.
What Happens Inside the Body During Squirting
Ultrasound imaging has provided the clearest picture of the mechanics. In women who report squirting, researchers have used real-time pelvic ultrasound to watch what happens during arousal and orgasm. The pattern is consistent: the bladder, which was emptied before the session began, fills noticeably during sexual stimulation and then empties rapidly at the moment of squirting.5The Journal of Sexual Medicine. Female Ejaculation, Squirting, and Coital Incontinence: A Systematic Review and Meta-Analysis of Biochemical, Imaging, and Urodynamic Diagnostic Criteria This rapid bladder filling is unusual. Under normal circumstances, the kidneys produce urine at a steady, slow rate. The fact that the bladder accumulates fluid so quickly during arousal suggests that something about the arousal process accelerates kidney output or alters how the bladder handles incoming fluid.
This bladder-filling pattern is a key piece of evidence for anyone trying to settle the “is it pee” question. The fluid unambiguously originates in the bladder. But it also unambiguously was not sitting there beforehand, since the participants urinated immediately before the study. Whatever fills the bladder during arousal is being produced in real time, and its dilute composition suggests it is not the same concentrated urine your kidneys produce overnight. Think of it as the bladder acting more like a reservoir that rapidly collects and then expels a watery fluid during a specific physiological event, rather than slowly storing waste between bathroom trips.
The Female Prostate and Why It Matters
The glands responsible for the PSA component sit in a ring of tissue surrounding the urethra, just behind the front wall of the vagina. These are the Skene’s glands, and researchers increasingly refer to them as the female prostate because their tissue structure and the proteins they produce closely resemble what is found in the male prostate.6Sexual Medicine Reviews. Should We Call it a Prostate? A Review of the Female Periurethral Glandular Tissue Morphology, Histochemistry, Nomenclature, and Role in Iatrogenic Sexual Dysfunction Their ducts open into the urethra, which is how their secretions end up mixed with the bladder-derived fluid during squirting.
The size and development of this glandular tissue varies considerably between individuals. Some women have well-developed periurethral glands; others have very little of this tissue. That variability may help explain why PSA shows up in some women’s squirting fluid but not others, and why the overall experience of squirting differs so much from one person to the next. It also means the ratio of “urine-like” to “prostatic” components in squirting fluid is not fixed. For some women the fluid is almost entirely bladder-derived; for others it contains a meaningful contribution from the female prostate.
This area of anatomy has historically been undertreated in medical education, and the female prostate is still absent from many standard anatomy textbooks. That gap has contributed to the confusion among both the public and clinicians. Some urologists have noted that pelvic surgeries, including certain procedures for urinary incontinence, can damage or displace this glandular tissue, with potential consequences for sexual function that are not always discussed with patients beforehand.7The Journal of Sexual Medicine. The prostate in women: an updated histological and immunohistochemical profile of the female periurethral glands and their relationship to an implanted midurethral sling
The Brain Region That Controls Both Urination and Orgasm
One reason squirting shares so much in common with urination is that both are controlled by overlapping neural hardware. The pelvic organs involved in sexual function and urinary voiding are innervated by the same sets of nerves, and coordinated by the same brainstem region.8PubMed Central. Neural Control and Physiology of Sexual Function: Effect of Spinal Cord Injury A structure in the pons called the pelvic organ stimulating center sends signals down the spinal cord to the sacral nerves that control the bladder, the bowel, and the reproductive organs. Neuroimaging research has found that this center activates on one side during urination and on the opposite side during ejaculation in men and orgasm in women.9The Journal of Sexual Medicine. Pontine Control of Ejaculation and Female Orgasm
The practical consequence is that ejaculation, orgasm, and urination are, at a deep neurological level, variations on the same voiding reflex. They use the same downstream plumbing and many of the same control signals, just activated in different patterns. This shared wiring explains why squirting involves the bladder at all: during intense arousal and orgasm, the brainstem is activating pathways that overlap with the ones it uses for urination. It is not a malfunction or a sign that something has gone wrong. It is the nervous system running a sexual program on hardware it shares with the urinary system.
How Common Squirting Actually Is
Prevalence estimates depend heavily on how the question is asked and who is being surveyed. A nationally representative U.S. study found that about 40% of adult women reported having squirted at least once in their lifetime, with a typical frequency of roughly three to five times total.10PubMed. Vaginal Squirting: Experiences, Discoveries, and Strategies in a U.S. Probability Sample of Women Ages 18-93 A Swedish cross-sectional study reported an even higher figure: about 58% of women had personal experience with ejaculation or squirting. That study also found that women with non-heterosexual orientations were more likely to have experienced it than heterosexual women.11PubMed Central. Women’s experiences of female ejaculation and/or squirting: a Swedish cross-sectional study
The range between studies partly reflects different cultural contexts and partly reflects the measurement problem: some surveys ask about “squirting,” some ask about “ejaculation,” and some lump the two together. Since many women are not sure whether what they experienced counts as either term, self-report data inevitably has some fuzziness. Regardless of the exact number, squirting is far from rare. It is a common physiological response that a large fraction of women have encountered at some point.
Why the “Just Pee” Framing Causes Real Harm
The question “is it pee?” rarely comes from pure scientific curiosity. For many women, it is loaded with anxiety, shame, or both. Research into the psychological dimensions of squirting has found that women who experience it report a wide range of reactions. Some describe it as amazing or empowering. Others find it embarrassing or distressing, and the distress is frequently tied to the belief that they are urinating involuntarily during sex.12Sexualities. A sexual superpower or a shame? Women’s diverging experiences of squirting/female ejaculation in Sweden Across the board, women in these studies expressed a desire for more accurate, less sensationalized information about what squirting actually is.
A case-control study comparing women who squirt with those who do not found that women in the squirting group reported lower levels of body image discomfort. The researchers suggested that anxiety, body image concerns, and social stigma around the perception of squirting as urination may influence whether a woman is able to relax enough to experience it, or whether she suppresses the response.13The Journal of Sexual Medicine. The squirt game. psychosexual characteristics of women experiencing squirting: Insights from a case–control study The flat dismissal that squirting is “just pee” does not just get the science wrong; it reinforces exactly the kind of stigma that can interfere with sexual enjoyment.
Clinically, this matters because some women bring up squirting with their doctors only to be told they have urinary incontinence. While coital incontinence is a real condition, it is physiologically distinct from squirting: incontinence typically involves urine leakage during physical exertion or penetration rather than a sudden expulsion timed to orgasm, and the two conditions have different underlying mechanisms and treatment implications. Misdiagnosing squirting as incontinence can lead to unnecessary medical interventions and deepen the patient’s sense that something is wrong with her body.
Stimulation and the Anterior Vaginal Wall
Women who squirt frequently report that the trigger involves stimulation of the front wall of the vagina, the area popularly associated with the G-spot. Research on this zone has been contentious for decades, but there is reasonable consensus that many women have a region of heightened erotic sensitivity along the anterior vaginal wall, and that stimulating this area is commonly associated with the expulsion of fluid through the urethra.14PubMed. The “G spot” and “female ejaculation”: a current appraisal The likely explanation is anatomical: the female prostate tissue and the surrounding nerve-rich tissue sit directly behind this wall, so pressure in that area stimulates both the glands and the nerve endings involved in the squirting reflex.
Not everyone who squirts does so through vaginal stimulation alone, though. The U.S. probability survey found that women reported squirting through a variety of activities, and the specific trigger varied widely between individuals. Some discovered it accidentally; others found it through deliberate exploration. The Swedish survey similarly found that the experience was not limited to any single type of sexual activity or partner configuration. Reducing squirting to “a G-spot thing” is another oversimplification that does not match the range of real-world experiences.
A Phenomenon Documented for Millennia
The modern scientific debate over squirting can make it seem like a recently discovered curiosity, but written descriptions go back thousands of years. Ancient Chinese Taoist texts from the fourth century discuss female fluid emission during sex. Indian texts in the Kāmaśāstra tradition describe it in detail. In the Western tradition, Aristotle wrote about it around 300 BCE, and Galen addressed it in the second century. The first recognizably scientific description came from Reinier de Graaf in the seventeenth century, who identified the periurethral glands and called them the female prostate, a term researchers are now circling back to.15PubMed. The history of female ejaculation
Despite this long history, the topic fell into a kind of scientific blind spot for much of the twentieth century, dismissed as either urinary incontinence or a myth. A review of 44 publications from 1889 to 2019 found that clinical and anatomical studies conducted in recent decades have produced substantial evidence supporting the reality of the phenomenon, but that views remain inconsistent across the medical community, with no clear consensus on the fluid’s biological function.16PubMed. Female ejaculation: An update on anatomy, history, and controversies The research base is growing, but it remains small compared to other areas of sexual medicine, and funding for this kind of work is notoriously hard to secure.
Male Squirting and What It Tells Us
An unusual case report added a piece to the puzzle by documenting squirting in a man. Using color Doppler ultrasound, researchers recorded strong contractions of the prostate and pelvic muscles just before the man expelled a stream of fluid that originated from the urinary bladder and traveled through the prostatic urethra.17PubMed Central. Male squirting: Analysis of one case using color Doppler ultrasonography The pattern was strikingly similar to what imaging studies show in women who squirt: rapid bladder involvement, pelvic muscle contractions, and expulsion through the urethra timed to orgasm. This single case does not prove anything definitive, but it supports the broader picture that squirting is a voiding-type reflex involving the bladder and pelvic musculature, mediated by the same brainstem pathways in both sexes. It also reinforces the idea that reducing the phenomenon to “urinary incontinence” misses the mark, since the male participant had no history of incontinence and the event was clearly tied to orgasm.
What Researchers Still Do Not Know
The biggest open question is why the bladder fills so rapidly during arousal in women who squirt. Normal kidney filtration rates cannot explain the volume of fluid that appears in the bladder over the course of a few minutes of stimulation. Some researchers have speculated that changes in blood flow to the kidneys during arousal may increase filtration speed, or that the bladder wall itself may play a role in transporting fluid. Neither hypothesis has been tested rigorously.
There is also no good answer yet for what biological purpose squirting might serve, if any. Some hypotheses propose a role in lubrication, antimicrobial protection, or reproductive facilitation, but these remain speculative. The PSA found in the fluid has known antimicrobial properties in other contexts, which makes the antimicrobial hypothesis at least plausible, but no study has directly tested whether squirting reduces infection risk. It is entirely possible that squirting is a byproduct of the shared neural circuitry between the sexual and urinary systems, with no independent adaptive function at all. The field is still too young and too underfunded to say.