While all women have a G-spot, it has been estimated between 10% and 40% of women are capable of ejaculation. The G-spot need not be stimulated for ejaculation to occur, but most women say that their first ejaculation experience came from massaging their G-spot. The response varies from a light sprinkle to a huge gush. I have experienced women who gushed huge amounts of fluid 10 feet out.
Researches have found that although many women feel a slight need to urinate right before ejaculation, the fluid is definitely not urine. Nor does it come from the Bartholin gland which produces a milky, odorless secretion that helps lubricate the vagina when sexually aroused.
Today we now know that the difference between women who squirt and those that don't is in the number and size of their pariurethral glands. They are analogous to the hundreds of tiny glands that constitute the male's prostate gland and are responsible for 15% to 50% of the fluid a man ejaculates.
The myths that female ejaculation is the result of poor bladder control, or excess secretion which sweats from the vaginal walls and pools in the back of the vagina to squirt out during the strong muscle contractions of orgasm, have been proven wrong. For decades many women felt it dreadfully abnormal and tried to hide or avoid it. Physicians in their ignorance tried to cure it. By questioning many women, researchers have established that about one woman in five ejaculates (through her urethra rather than her vagina), some of the time but not always. The stimulation of the G-spot produces both her ejaculation and her deep uterine contractions.
Besides the famous study of Whipple and Perry of Dr. Ernest Grafenberg's 1950 article about the spot, in Nova Scotia researcher Ed Belzer explored the chemical composition of female ejaculate. In Florida Helen Robinson and Sharon Pietranton worked with groups of ejaculating women. At first American gynecologists, routinely trained not to sexually stimulate their patients, were astonished that Dr. Grafenberg was on such sensual terms with his. Generations of gynecologists have tied to cope with "hypersecretors" blaming it on poor bladder control.
"Women's response to direct stimulation of the G-spot is identical to the response of males when their prostate is stimulated," Perry and Whipple observed. The first few seconds of stimulation produces a strong feeling that they have to urinate. This feeling lasts for two to ten seconds, maybe longer, before changing to a distinctly sexual enjoyment. Whipple felt that most women when faced with this sensation hold back their sexual response to keep from wetting on their partners. Perry theorized that this may explain why up to 25% of American females never have orgasms - they've learned early that to avoid the embarrassment of urinating during sex, they have to hold back.
Women with well-toned PC muscles are more likely to ejaculate and generally have better orgasms. Many women ejaculate easier after they’ve “primed the pump” with a few orgasms, others come on their first one. The common theme seems to be extreme arousal and direct G-spot and clitoral stimulation for an extended time.
It is common for writers of porn films and erotic books to make it appear that male ejaculations "shoot" or "spurt". But Kinsey's observations of hundreds of male ejaculators showed that in about 75% of men the semen merely exudes from the meatus or is propelled with so little force that the liquid is not carried more than a very small distance beyond the tip of the penis. In short, most males ooze rather than shoot. Their semen doesn't spurt, it dribbles out.
Similarly, if a woman expels fluid other than urine from her urethra, she shouldn't have to make it squirt for it to qualify as ejaculation. The fact that many women don't notice it since its not a powerful squirt contributes to the underreporting of female ejaculation. Other women, including one of my (Dave's) partners, very strongly squirt large amounts of fluid while having powerful G-spot orgasms.
Helen Robinson reported that one of her research subjects was highly orgasmic and continued to ejaculate copiously with each orgasm and would ejaculate a quart of fluid in one session. A teaspoon of fluid is the more common amount, but a cupful is not uncommon.
At Dalhousie University professor Ed Belzer found varying concentrations of acid phosphatase in the women's ejaculate. This chemical had previously been thought to be produced only by males, and in some courtrooms was accepted as evidence to support a rape charge. Belzer's discovery proved that it wasn't urine and also pointed out the existence of a genuine female prostate-like gland.
Not only are the fluids they produce chemically similar, the female prostate acts like the male prostate: when rhythmically prodded, it swells up and then discharges fluid through the urethra. To reach a male's prostate gland, you have to reach in through his anus. In the female, you reach in - at virtually the same angle - through her vagina.
There has been debate whether the ejaculation originate from the bladder or from the urethral glands and ducts. Both may be the case in that a small amount of fluid may be released from the urethral glands and ducts in some instances and mixed in the urethra with a clear fluid that originates in the bladder.
Tests have been done where the bladder is drained of urine before the sexual stimualation and resulting ejaculation. Even though their bladders had been drained, they still expelled from 50 ml to 900 ml of fluid through the tube and into the catheter bag. The only reasonable conclusion would be that the fluid came from a combination of residual moisture in the walls of the bladder and from post draining kidney output.
Regardless, a number of tests have chemical analysis have been done on the fluid. Exactly what it is, isn't known but there is a consistency of results that show a greatly reduced concentration of the two primary components of urine, urea and creatinine, in the expelled fluid.
As Unv of So Calf tests showed the results were clearly "out of the range" to be defined as urine.
But women's sexuality still remains a mystery (as women do in other ways ... as the exact source and exactly what the fluid is remains natures secret.