Squirting is not purely urine, but it’s mostly urine. The best available research shows that the fluid expelled during squirting is primarily a diluted form of urine mixed with small amounts of secretions from glands near the urethra. This isn’t a simple yes-or-no question, and the science behind it is more nuanced than most people expect.
What Ultrasound Studies Actually Show
The most direct evidence comes from a study published in the Journal of Sexual Medicine that used pelvic ultrasound to watch what happens inside the body before, during, and after squirting. Researchers asked participants to empty their bladders completely, confirmed the bladders were empty on ultrasound, then monitored them during sexual stimulation. Just before squirting, the ultrasounds showed the bladders had noticeably refilled. Immediately after squirting, the bladders were empty again.
That finding is hard to argue with: the fluid is coming from the bladder. The researchers concluded that squirting is “essentially the involuntary emission of urine during sexual activity, although a marginal contribution of prostatic secretions to the emitted fluid often exists.”
It’s Not Exactly the Same as Urine
Chemical analysis of squirting fluid consistently finds urea and creatinine, two waste products that are hallmarks of urine. But the fluid also contains markers that urine doesn’t normally have, specifically proteins associated with the Skene’s glands, two small glands that sit on either side of the urethra. These glands develop from the same embryonic tissue as the male prostate, which is why they’re sometimes called the female prostate.
So the fluid is a blend. Most of it is diluted urine expelled from the bladder, with a smaller contribution of secretions from the Skene’s glands that get mixed in as the fluid passes through the urethra. The ratio varies from person to person, and even from one occasion to the next. Some samples look almost identical to urine under lab analysis. Others contain higher concentrations of glandular proteins. This variability is part of why the debate has persisted for so long.
Squirting and Female Ejaculation Are Two Different Things
One major source of confusion is that “squirting” and “female ejaculation” are often used interchangeably, but they’re distinct phenomena that can happen separately or at the same time.
- Female ejaculation is a small amount of thick, whitish fluid produced by the Skene’s glands. It contains proteins similar to those found in male semen. The volume is typically very small.
- Squirting involves a much larger volume of fluid, sometimes comparable to a glass of water, that is primarily diluted urine from the bladder.
The prevalence of female ejaculation ranges widely in studies, from 10 to 54 percent of women, depending on how it’s defined and measured. Both squirting and ejaculation can occur during the same sexual experience, which is likely why their fluids get conflated in casual conversation.
Why the Bladder Fills So Quickly
One of the more surprising findings from ultrasound research is how rapidly the bladder refills during arousal, even after being fully emptied. This isn’t the slow, gradual filling that happens over hours as your kidneys filter blood. During sexual stimulation, increased blood flow to the pelvic region appears to accelerate urine production by the kidneys. The bladder can accumulate a noticeable amount of fluid in a relatively short window of arousal, which is then expelled during squirting.
This rapid filling helps explain why the fluid often looks and smells different from regular urine. It’s more dilute because the kidneys are producing it quickly rather than concentrating it over time. The color tends to be clearer, and the odor is typically much milder than what you’d notice in a normal trip to the bathroom.
What the Skene’s Glands Actually Do
The Skene’s glands are tiny structures that play a few roles in everyday urogenital health. They secrete fluid during sexual arousal that helps lubricate the urethral opening. They also produce a substance that may help prevent urinary tract infections by creating a protective barrier against bacteria. During orgasm, some people’s Skene’s glands produce a milky secretion that contains proteins similar to those found in male prostatic fluid.
The size and activity of Skene’s glands vary significantly between individuals. Some people have larger, more active glands that contribute more secretion to the fluid mix. Others have very small glands that contribute almost nothing. This anatomical variation is one reason why the chemical composition of squirting fluid differs so much from person to person, and why some people experience squirting while others don’t.
Why This Matters Less Than You Think
The fluid is mostly urine by composition, but calling it “just pee” misses the point. It’s an involuntary physiological response to sexual arousal, not a loss of bladder control in the traditional sense. The mechanism is different: the bladder rapidly fills with highly diluted urine during arousal, and pelvic muscle contractions during orgasm or intense stimulation expel it. The fluid passes through the urethra, picking up Skene’s gland secretions along the way.
For people who experience squirting and feel self-conscious about it, the key takeaway is that this is a well-documented physiological response. It’s not a sign of incontinence or a medical problem. Emptying your bladder beforehand may reduce the volume but won’t necessarily prevent it, since the bladder refills quickly during arousal. Keeping a towel handy is the most practical solution most people land on.