Further to my earlier msg, this is an area of human sexuality I have done extensive research on, in order to pleasure my female lovers in as many ways possible! As I mentioned earlier, many scientific experiments have been conducted, and have concluded that the liquid being "squirted" is NOT Pee. (Although that is not always the case in porn- or is it erotica(?) where it is "faked" for the amusement of the viewer.)
The liquid is in fact what they are calling "prostate specific antigen", with only minute trace amounts of "wee" since its chosen path of expulsion is through the urethra, (similar to a male's ejaculate). I have also conducted my own experiment, trust me... it is NOT "wee"! LOL
I don't know why it is called PSA since women obviously do not have a prostate. I am not a gynecologist, or a doctor of any kind, nor am I a scientist... but, all humans are essentially the same prior to conception (in that the default sex for all human ovum is female...) and that gender specifics are determined AFTER conception in the womb (based on the number of X &/or Y chromosomes in the male sperm cell...) if the male chromosome is dominant, the ovaries develop into testicles, clitoris into a penis etc... That being said, the female equivalent to the male prostate gland IS present in a female... but for one reason or another they call it something else entirely.
The female "prostate" is also known as the skeens gland, or perhaps you may have heard it being referred to as the grafenberg spot (after German physician "Ernst Grafenberg") or simply the G-spot. (This is also why the prostate gland is sometimes referred to as the male "g-spot"). Anyway, the skeens gland secretes essentially the same fluid along the urethra in females as the prostate does in males... but for some other unknown reason they do not rename it for females... This PSA fuid is the same stuff that lubricates the vulva etc on a female, making intercourse much more pleasurable. In most cases, the fluid is slowly secreted out onto the vulva producing the "wet pussy" we are all so fond of...

but in some cases, with enough stimulation, the G-spot or skeens gland will actually "ejaculate" this fluid out of the female's urethra in much the same way as an ejaculation does in a male.