All women who achieve orgasm ejaculate, however most women experience what's called a "retrograde ejaculation" when they orgasm. The ejaculatory fluid never makes it into the urethral canal because it is being blocked by muscles in the vaginal region that cause the fluid to instead back up into the bladder. The fluids are expelled when urinating following an orgasm. This is why women usually need to pee after sex. And this is also why you hear the term "learning to ejaculate" when talking to women who didn't ejaculate until they learned or were coached through the process of identifying the muscles and consequently controlling that muscle group. This can be done through various exercises, but can be tricky for some women because the muscle group is also responsible for keeping urine from entering the urethral canal and the fear of urinating during sex can be a hurdle.
The reason many women only ejaculate during a g-spot orgasm and not during a clitoral orgasm is that the pressure being placed on the g-spot is causing a reflexive muscle reaction like mild spasms (similar to when the doc taps on your knee with a mallet in that spot that causes you to kick) to the very same muscles that keep urine and female ejaculatory fluid from entering the urethral canal. This is the likely cause of urine being identified as the fluid ejaculated by some women. Learning to control that muscle group and how to keep urine from entering the urethra without closing it off to the glands that produce the ejaculate is best for those women, rather than playing roulette with with your g-spot or worse yet, not allowing yourself to enjoy g-spot stimulation.
The female ejaculate fluid is similar chemically to the fluid "base" in a mans ejaculate (when males ejaculate the sperm are released from one area and the "base" fluid from another area and mixes into semen in the urethra during orgasm) . Women who "squirt" before orgasm are experiencing the equivalent of "pre-jaculation" in a man. The big mystery, or mysteries (because there are two) are; (1) What is the biological purpose of female ejaculate? and (2) Why do women seem to produce so much more ejaculatory fluid than men?
The fact is, we don't know, and the taboo nature of the subject has caused scientific evaluation of this biological function to also become taboo from a clinical or professional stand point, as well as a political land mine (possible social ramifications?). Science is full of these examples of why science can't be trusted, but I digress.
However, an important recent clinical study was done that evaluated urine samples from women who ejaculate and women who don't. In short, the urine samples of women who didn't ejaculate contained the chemicals found in male and female ejaculate, while urine samples of women who did ejaculate did not contain those chemicals. The conclusions from this study are my source for some of the info in the first paragraph. This study was a big breakthrough in my opinion, not because of the results, but because the study was discussed on Oprah. So if you're interested but don't like reading, you can find the Oprah show online.
I read some of the comments on this article and I noticed some from woman who ejaculate and don't like it, and one even said that she was considering seeing a doctor to "un-learn how to
ejaculate", based on the fact that some women actually "learn how to ejaculate". In response to her comment, which I feel compelled to make, I want to first preface it by stating that I am a man of the extremely heterosexual variety. I know this because I think about (let me be frank) sex constantly, and that's if I'm not looking at sex on a screen, or when significant astrological formations occur, enjoying actual sex. I'm 36 years old, I love vaginas as much or more than when I was 18. I even thought vaginas were awesome back when I thought girls were gross. *Please note that I have no problem with gay guys at all, I have gay friends, in fact. I would like to see a much higher percentage of men on the gay team. I think 80-85 percent is reasonable.*
So, in response to the woman who wants to learn how not to "squirt" and to women everywhere who ejaculate and don't enjoy it, I say this. If your partner/s are not fond of your femfluid or the source of your negative feelings about ejaculating, then they must not like it, and if they don't like it why give it to them? I know I'm not the only guy who will proudly admit that he swallows and who happily sleeps in the wet spot. I wouldn't even bother trying to have sex with a woman if she expressed a dislike for ejaculate.
And if your partner isn't the cause of your negative feelings towards your own ejaculating, then you are the likely source. And if you're the source, and you're not tied up in "location" (which gives the "inconvenience" and "too messy" excuses some legitimacy) it begs the question, why?
Why I can only guess, but my guess is the most likely I'm guessing. It's physical evidence of either sexual desire or sexual satisfaction. And if this occurs during sex with a partner, that person will naturally allow themselves at least partial credit for the arousal and/or a job well done. But what if the person you're having sex with, you view in an adversarial way, or worse, like an enemy? That physical evidence, in reality, is proof of nothing more than a female who finds her sexual partner desirable and/or she had an orgasm during vaginal/anal or from receiving oral sex.
It's normal that one would choose to have sex with someone that they found sexually attractive, and having an orgasm during, or as the finale of sex with that someone would be a desirable outcome normally, right? But some women feel that they are arming the enemy, who is also their sexual partner (I use the word partner instead of men because I don't know for sure that this does not occur with lesbians, although I doubt that it does), when they allow their partners to know they enjoy the pleasures given them, and an ejaculating orgasm would logically be the most convincing and undeniable expression of that temporary joy possible. And while in reality that "squirting" event doesn't provide any firepower for the enemy, it may swell the enemy's pride a bit.
Technically, female ejaculate does provide a social counterclaim to a defamatory accusation levied by a "squirter" upon a sexual partner, regarding the partner's disappointing bedroom expertise. A valid "squirt" counterclaim can only be made by someone who is moderately to very paranoid about their social status, has plenty of nerve, and enough craftiness to successfully conduct a "Lewinsky" operation and remain undetected, with the evidence safely stored in an undisclosed location.