What Causes Women to Squirt: Anatomy and Triggers

Squirting during sexual activity results from a combination of intense arousal, bladder mechanics, and the anatomy surrounding the urethra. Research using ultrasound imaging has confirmed that the bladder fills rapidly during heightened sexual stimulation and then empties at the moment of squirting, producing a noticeable expulsion of fluid through the urethra. The fluid is primarily dilute urine, though it frequently contains secretions from glands near the urethra that are structurally similar to the male prostate. Understanding the anatomy and triggers involved clears up a lot of confusion about what is happening, why it varies so much from person to person, and how it differs from other types of fluid release during sex.

The Anatomy Involved

Three structures work together during squirting: the bladder, the Skene’s glands (also called the paraurethral glands or the female prostate), and the broader tissue zone where the clitoris, urethra, and vaginal wall converge. Each plays a distinct role.

The Skene’s glands sit on either side of the urethral opening. An immunohistochemical study examining urethral tissue from women of all ages found paraurethral glands in nearly all specimens, and about 83% of those glands tested positive for prostate-specific antigen (PSA), the same marker produced by the male prostate.¹ Electron microscopy work has further shown that these glands contain active secretory cells, confirming that they function as a genuine secretory organ rather than a vestigial structure.² The whitish fluid these glands produce is small in volume and biochemically distinct from the larger gush associated with squirting.

The second key piece of anatomy is the clitourethrovaginal (CUV) complex. Imaging studies have shown that the clitoris, urethra, and front vaginal wall are not separate organs floating independently but rather a tightly intertwined zone. Stimulation of the anterior vaginal wall, often described loosely as “G-spot” stimulation, actually engages this whole complex at once. There is no single discrete spot; the region varies in size and sensitivity from one person to the next.³ That variability is part of why the same type of stimulation produces squirting in some women but not others.

The bladder itself is the third structure. Its role surprised many researchers and is the most counterintuitive part of the process.

What Happens Inside the Bladder

Ultrasound monitoring before, during, and after squirting has provided the clearest picture of the mechanics. In a well-known study, participants emptied their bladders completely before sexual stimulation, which ultrasound confirmed. As arousal increased, a second scan showed that the bladder had refilled noticeably. Immediately after squirting, a third scan showed the bladder was empty again.⁴ This rapid fill-and-empty cycle happens over the course of minutes, far faster than normal urine production.

A separate visualization study reinforced this finding by having participants ingest a dye that concentrated in the bladder. When squirting occurred, the expelled fluid was colored by the dye, confirming that the bladder was the source of the volume.⁵ A systematic review and meta-analysis covering multiple imaging studies reached the same conclusion: the bladder fills during arousal and empties at the moment of squirting.⁶

The mechanism behind this rapid bladder filling is not fully understood. The kidneys do not suddenly produce urine many times faster than normal. Some researchers have suggested that increased blood flow to the pelvic region during arousal, combined with changes in pressure and hormonal signaling, could accelerate filtration into the bladder. But at this point, that remains a gap in the science.

What Is in the Fluid

The expelled fluid during squirting is chemically similar to very dilute urine. Biochemical analysis shows it contains urea, creatinine, and uric acid at concentrations comparable to the urine samples collected before stimulation began.⁴ But there is a notable addition: in most participants, the squirting fluid contained PSA, the enzyme produced by the Skene’s glands, even though PSA was absent from the urine collected before arousal began. The dye-based visualization study also found PSA in the squirting fluid of most participants.⁵

This means the fluid is a mix. The bulk of the volume comes from the bladder, but Skene’s gland secretions get swept into the flow as it passes through the urethra. The proportion of each varies from person to person and likely from occasion to occasion. Some researchers have proposed that the PSA-containing component may have antibacterial properties that help protect the urethra, though that hypothesis has not been confirmed in human studies.⁷

Squirting and Female Ejaculation Are Two Different Things

This distinction trips up almost everyone, including many healthcare providers. Squirting and female ejaculation are separate phenomena that involve different fluids, different volumes, and different sources, though they can happen at the same time.

Female ejaculation is the release of a small quantity of thick, whitish fluid from the Skene’s glands. This fluid is biochemically closer to components of male semen than to urine, with high concentrations of PSA.⁸ The volume is small enough that many women who experience it may not even notice.

Squirting, by contrast, involves a much larger volume of fluid that is essentially dilute urine with a variable contribution of prostatic secretions, as described above. A systematic review confirmed this two-phenomenon framework: female ejaculation produces a small amount of whitish secretion from the female prostate, while squirting produces a larger amount of diluted urine, and both can occur simultaneously during the same sexual episode.⁹ A narrative review confirmed that the two involve different mechanisms entirely.¹⁰

The popular use of “squirting” and “female ejaculation” as interchangeable terms creates real confusion, both in bedrooms and in medical offices. A woman who produces a small amount of milky fluid is probably experiencing female ejaculation. A woman who soaks the sheets is probably squirting. A woman who experiences both at once is not unusual.

How Squirting Differs from Coital Incontinence

Because squirting fluid is largely urine, a reasonable question is whether it is simply urinary incontinence during sex. The answer is no, though the overlap can be genuinely hard to sort out clinically.

Coital incontinence (CI) comes in two forms. One happens during penetration itself and is usually associated with stress urinary incontinence, where physical pressure on the bladder causes leakage. The other happens at orgasm and is linked to overactive bladder contractions. Both forms are considered urological conditions with specific treatment pathways.⁹

Squirting, on the other hand, is tied to high levels of sexual arousal rather than to a bladder dysfunction. Women who squirt typically do not leak urine during other physical activities like coughing, sneezing, or exercise. The rapid bladder filling that precedes squirting appears to be a response to arousal specifically, not a structural weakness. That said, some women experience both squirting and coital incontinence, which can make it difficult for them and their doctors to figure out what is going on. If fluid loss during sex causes distress or happens outside of high-arousal contexts, a medical evaluation can help distinguish between the two.

What Triggers Squirting

No single technique reliably produces squirting in all women. The research and qualitative accounts point to a combination of physical and psychological factors that tend to be present when it happens.

On the physical side, stimulation of the anterior vaginal wall is the most commonly reported trigger. This area, located a few centimeters inside the vaginal opening on the front wall, sits right over the CUV complex, meaning pressure there engages the urethra, the surrounding Skene’s glands, and the internal structure of the clitoris simultaneously.³ The tissue in this area varies considerably in sensitivity and size between individuals, which is why some women find it responsive and others find stimulation there unremarkable.¹¹

Firm, rhythmic pressure tends to be more associated with squirting than light touch. Many women who squirt report that it builds over a period of sustained stimulation rather than happening suddenly. Combined clitoral and vaginal stimulation, whether from a partner’s hand, penetration at certain angles, or a vibrator, is frequently described as more effective than either alone.

But the physical side alone does not account for it. Arousal level appears to be a prerequisite. The ultrasound studies showed that bladder filling was linked to the degree and duration of sexual excitement, not simply to the type of physical contact. Women who squirt regularly have described it as something that happens when arousal reaches a particular intensity and they are able to let go rather than tense up.

The Role of Relaxation and Mental State

Qualitative research with women who squirt has consistently found that psychological relaxation plays a major role. In one descriptive study, participants described learning to relax the pelvic area rather than contract it, and noted that their ability to squirt improved over time as they became more comfortable with the sensation. As one participant put it, she learned to relax and “make it happen” in certain positions, but still could not choose exactly when it occurred.¹²

This makes physiological sense. The pelvic floor muscles surround the urethra, and tension in those muscles can effectively clamp it shut. Consciously or unconsciously bearing down or releasing tension in the pelvic floor changes the dynamics of fluid release. Many women report that the sensation just before squirting resembles a feeling of needing to urinate, which causes some to reflexively tighten up and suppress it. Women who squirt regularly have typically learned to push past that reflex rather than fight it.

Trust and comfort with a partner, freedom from self-consciousness, and feeling safe enough to let the body do what it is doing without interference all emerge as themes in the qualitative research. This does not mean squirting is “all in your head”; the bladder mechanics and glandular anatomy are real and measurable. But the mental state appears to determine whether the physical conditions translate into an actual expulsion of fluid or get suppressed.

How Common Is Squirting

Prevalence estimates vary widely, partly because surveys define the phenomenon differently and partly because many women are not sure whether what they experience counts. A U.S. probability sample of adult women found that about 40% had squirted at least once in their lifetime, with a median frequency among those who had experienced it of three to five times total.¹³ A Swedish cross-sectional study found a higher proportion, with about 58% of women reporting personal experience of ejaculation or squirting, though most said it occurred only on a few occasions. Just 7% said it happened every time during sexual activity.¹⁴

The spread between these numbers likely reflects differences in how the questions were framed, cultural willingness to report, and whether respondents grouped small amounts of fluid with larger gushes. What is clear is that squirting is not rare, not universal, and highly variable in frequency even among women who do experience it. Some women squirt easily and often, some experience it a handful of times in their lives, and many never do. None of these patterns indicates a problem.

Why the First Experience Often Catches Women Off Guard

The Swedish study found that the most common reaction to squirting for the first time was shock and shame, reported by about 28% of respondents. A quarter of women thought they had urinated. Nearly as many, about 27%, described the experience in positive terms from the start.¹⁴ The confusion is understandable: the sensation of needing to urinate, followed by a sudden release of fluid, maps easily onto the experience of involuntary urination if you have never heard of squirting or do not know what it involves physiologically.

This is one area where better public understanding could make a real difference in how women experience their own bodies. Many women who initially felt embarrassed or alarmed describe feeling relieved once they understood the anatomy and learned that squirting is a recognized physiological response to arousal, not a sign of incontinence or anything going wrong. Partners’ reactions also matter. A partner who reacts with surprise or negativity can reinforce shame, while a partner who understands what is happening tends to defuse the anxiety.

Hormonal Influences and Individual Variation

The Skene’s glands, like the male prostate, appear to be hormone-sensitive, though human research on this point is limited. Animal research has shown that hormonal fluctuations across reproductive cycles alter both the size and secretory activity of the female prostate, with estrogen and progesterone peaks driving increased glandular growth and secretion.¹⁵ Whether similar hormonal effects explain why some women find squirting easier at certain points in their menstrual cycle, or why it may change after menopause or with hormonal contraceptive use, has not been well studied in humans.¹⁶

Individual variation in Skene’s gland size and development is substantial. Some women have well-developed glands, while in others the glands are small or nearly absent. The original immunohistochemical study found paraurethral glands in 18 out of 19 specimens, but the intensity of PSA staining varied considerably.¹ This anatomical variability likely contributes to the wide spectrum of experiences women report, from copious squirting to no noticeable fluid at all. The variation appears to be natural and does not track neatly with age.

A Phenomenon Recognized for Centuries

Squirting and female ejaculation are often discussed as though science only recently stumbled onto them, but written descriptions go back thousands of years. Chinese Taoist texts from as early as the fourth century described female fluid emission during orgasm. Indian texts from the seventh century onward, including several works of the Kāmaśāstra tradition, described both the fluid and the sensitive anterior vaginal region in detail. In the Western tradition, Aristotle mentioned female emission around 300 B.C., and Galen wrote about it in the second century.¹⁷

The first scientific description of the paraurethral glands as a “female prostate” came from the Dutch anatomist Reinier de Graaf in the seventeenth century. That understanding persisted in medical literature for several hundred years before the phenomenon fell out of mainstream medical discussion in the mid-twentieth century. Ernst Gräfenberg’s 1952 paper on the role of the urethra in female orgasm helped revive interest, but the topic remained contentious in clinical and academic circles for decades afterward.¹⁷ A review of 44 publications spanning 1889 to 2019 concluded that the cumulative anatomical and clinical evidence now provides substantial support for recognizing squirting and female ejaculation as real physiological events.⁷

The long history matters because it makes clear that the modern “debate” about whether squirting is real was never really about the evidence. The anatomy has been documented for centuries. What held the science back was a broader cultural discomfort with female sexual response that made funding scarce, journal editors cautious, and many clinicians dismissive. That climate has shifted, but it left a legacy of misinformation that still circulates widely.

1
PubMed. Homology between the female paraurethral (Skene’s) glands and the prostate. Immunohistochemical demonstration
2
PubMed. Ultrastructure of the normal adult human female prostate gland (Skene’s gland)
3
PubMed. Beyond the G-spot: clitourethrovaginal complex anatomy in female orgasm
4
PubMed. Nature and origin of “squirting” in female sexuality
5
PubMed. Enhanced visualization of female squirting
6
The Journal of Sexual Medicine. Female Ejaculation, Squirting, and Coital Incontinence: A Systematic Review and Meta-Analysis of Biochemical, Imaging, and Urodynamic Diagnostic Criteria
7
PubMed. Female ejaculation: An update on anatomy, history, and controversies
8
The Journal of Sexual Medicine. New Insights from One Case of Female Ejaculation
9
PubMed. Female ejaculation orgasm vs. coital incontinence: a systematic review
10
PubMed. Differential diagnostics of female “sexual” fluids: a narrative review
11
The Journal of Sexual Medicine. Who’s Afraid of the G-spot?
12
The Journal of Sexual Medicine. Experiences of young women in the practice of squirting: a descriptive qualitative study
13
PubMed. Vaginal Squirting: Experiences, Discoveries, and Strategies in a U.S. Probability Sample of Women Ages 18-93
14
Sexual Medicine. Women’s experiences of female ejaculation and/or squirting: a Swedish cross-sectional study
15
Biology of Reproduction. Hormonal Oscillations During the Estrous Cycle Influence the Morphophysiology of the Gerbil (Meriones unguiculatus) Female Prostate (Skene Paraurethral Glands)
16
International Journal of Clinical Nephrology. Skene’s Glands: Anatomy, Function, and Clinical Significance in Female Urogenital Health
17
PubMed. The history of female ejaculation