Here’s an awesome question:
What is squirt? I have never received a good explanation of exactly what this liquid is.
“Squirt” – the fluid emitted from the urethral sponge by women who ejaculate is, very specifically, female ejaculate. It’s not urine, it’s not vaginal secretions, it’s just… female ejaculate.
In a 2007 paper titled “The female prostate revisited: perineal ultrasound and biochemical studies of female ejaculate” Austrian researchers examined the urine and ejaculate of two 40-something premenopausal women who ejaculated regularly.
Biochemically, parameters of the examination of the ﬂuid emitted were clearly different than urine voided prior to sexual activity. Biochemical parameters … show that the source of ﬂuid expulsion during orgasm is not urine, but is rather similar to male ejaculate.
Another study, a 2011 analysis of one 43 year old women’s ejaculate found that two different fluids – neither urine, neither vaginal secretions – were expelled, which might account for the wide variability in reports of female ejaculation as abundant or scanty, clear or cloudy, etc. The authors wrote:
First, a clear and abundant fluid was expelled in gushes. This fluid (squirting) is a thin, watery liquid, with little or no color, or smell, and without apparent aspect of urine. Immediately after the first abundant fluid, another fluid was expulsed and collected. The latter fluid (ejaculate) was very scanty, thick, and milky in aspect, similar to the male semen (Figure 1C). Microscopic examination of the fresh fluid revealed numerous epithelial cells and little bacteria (Figure 1D). Cultures of the ejaculate revealed the saprophytic nature of the bacteria. Interestingly, no Döderlein’s bacteria have been found, suggesting that the vaginal environment is not involved in the phenomenon.
(A) Squirting fluid, 2 hours after collection. (B) The same squirting fluid (left) and morning urine (right). Note differences in color. © Macroscopic aspect of the female ejaculate, 2 hours after collection. (D) Microscopic aspect of the female ejaculate (Magnification 400×). :::
Research is fairly sparse, and not all that exists is particularly useful (e.g., this 2009 Egyptian study examined 38 women with no history of ejaculation, and found… no evidence of ejaculation – duh) but the best available account of how female ejaculation happens for some women is this:
Male seminal fluid – ejaculate minus the sperm – is produced mostly by two organs: the seminal vesicles and the prostate. In a male body, the prostate is located at the base of the bladder and, in addition to producing seminal fluid, it also swells up around the urethra during sexual arousal, so that he can’t pee while he’s aroused. (Anyone who has tried to pee with an erection or shortly after orgasm will know that you have to take deep cleansing breaths and wait for your arousal to go down before you can pee.)
Females have a homologous organ – that is, it has the same biological origin as the prostate. It’s located in the area between the urethra and the vagina.
Like the prostate, it swells up during sexual arousal. And, it appears, in some women, with some partners, sometimes, it also produces fluid that can be expelled.
It’s female ejaculate.