The Release of Fluid During Sex: Female Ejaculation, The G-Spot, & Urination

I recommend reading the introduction at the beginning of the article about female ejaculation prior to continuing.

Women indicate a wide range of experiences when it comes to the release of fluid (urine or ejaculate) during their sexual activities, and existing medical evidence suggests an anatomical basis for this diversity. There are reflex arcs involving the urinary and sexual organs that may explain the connection women commonly experience between urination and sex.

 

The Mechanism of Female Ejaculation Discovered?

Rear View of Nude Black Woman
Medical science cannot always explain why women release fluid from their bladder during sex, but early indications are that it is normal.

Preliminary medical findings may indicate the mechanism of female ejaculation, the how and why the release of fluid from the bladder occurs during sexual arousal and orgasm [1]. A medical article published in 2011 provides evidence of a urethra-to-bladder reflex arc, which when stimulated causes a sustained or transient contraction of the bladder, depending on where the urethra is stimulated. Stimulation near the bladder neck resulted in a sustained contraction, stimulation near the external orifice resulted in shorter duration (transient) contractions.

This reflex contraction occurred as a result of electrical stimulation of the urethra. It seems possible for this reflex to be activated by physical stimulation of the urethra, more commonly referred to as G-Spot stimulation. By nature of being a "reflex" women don't have voluntary control over it. The nervous and muscular events associated with orgasm, the resulting electrical and chemical impulses, may also facilitate female ejaculation, and urinary events, because the associated anatomy is so intermingled. (See Illustration and MRI Image)

The necessity of a nearly full to full bladder to facilitate the reflex [1] would generally stipulate ejaculation occur later in a sexual experience, after several minutes of sexual stimulation, to allow time for the bladder to fill. A sustained contraction of the bladder would likely result in a constant flow, gush, or flood of fluid from the bladder whereas multiple momentary contractions may result in a more forceful squirting of fluid. This may explain why women experience one type of release of fluid during initial sexual stimulation and arousal, and another form of release during G-Spot stimulation and orgasm. Which occurs may depend on whether the voluntary and/or involuntary nervous systems are being activated.

This reflex was activated in half of the individuals in the study of 6 individuals, one of which was a female. The reflex was know to exist in cats***, but was only recently confirmed to exist in humans. Current medical knowledge indicates 50% of women (1 out of 2) have functional prostate glands, and my surveys indicate up to 46% of women have experienced female ejaculation. These surveys also indicate 54% of women have a "very distinct" or "distinct" G-Spot. While a bit of a leap at this point, there is scant medical evidence to suggest 50% of women have the anatomical means and physical experience of female ejaculation.

There is also a urethra-to-bladder reflex that occurs when the urethra is dilated that results in bladder contraction [13]. The sexual implications of which are harder to discern, but suggest stretching of the vaginal wall may stretch the urethra, activating this reflex. All we can say for sure about these studies is, there are situations in which the bladder automatically contracts and tries to empty.

It is important to acknowledge that no one, to my knowledge, has evaluated the effects of sexual stimulation and arousal and orgasm on these reflex responses. These sexual experiences may facilitate, suppress, or have no influence on these reflexes.

Not Two, But Three Nerve Pathways

Relatively recent medical research has revealed a third nerve branch supplying the region of the (prostatic) urethra and vagina [1][2]. Historically we knew there was one nerve pathway, the pelvic plexus, that passed through the internal pelvic area that supplied autonomic (involuntary) control of the sexual and reproductive organs. A second pathway, part of the pudendal nerve, was closer to the surface of the body and provided somatic (voluntary) control and physical sensation. This third pathway, also part of the somatic (voluntary) pathway and a branch of the pudendal nerve, passes near the internal autonomic pathway to the area of the urethra and vagina. It was also recently discovered that the autonomic and somatic nervous systems aren't as distinct and isolated as we once believed, they are intermingled.

Autonomic and Somatic Nerves of Female Pelvis
This illustration shows the nerves supplying the female pelvic and genital organs. Moving your mouse cursor over the image highlights the nerves that supply the urethra and paraurethral glands, vagina, and clitoris. The somatic (voluntary) nerves originate from the pudendal nerve and follow two pathways: 1- supralevator or intrapelvic pathway (IPP), between the pelvic fascia and the levator ani muscle and terminates lateral to the vagina and urethra 2- extrapelvic pathway (EPP) which could be traced to its origin from the pudendal nerve at the ischiorectal fossa. AN, autonomic nerves (orange); PP, pelvic plexus; PN, pudendal nerve; DNC, dorsal nerve of the clitoris; IPP, intrapelvic pathway (red)(supralevator); EPP, extrapelvic pathway (yellow)(infralevator) Source - Additional Images

At this time, we don't know how this third pathway controls the internal sexual and reproductive organs or what type of sensitivity to stimulation they provide, or how exactly the intermingling of the autonomic and somatic nervous systems come into play. All we can conclude is, the anatomy of the region is more complex than originally believed. Even prior to these recent discoveries, there was no consensus on how the urinary and sexual organs function, in relation to the urethra and urination, let alone the sexual implications. I've always presumed the nerves that allow the male prostate to be sensitive to physical stimulation are present and functional in some women, and this would be evidence to support that believe.

No G-Spot?

It is my believe that the "G-Spot" is the normal innervation of the urethra and paraurethral and prostate glands, and that is why no one can find it, at least medical evidence of it. Normal anatomical diversity may explain why some women "experience" having one, while others don't. Some of the 70% of women who indicate they have a G-Spot may have one simply because they are expected too, to be normal, by today's societal expectations of them.

The urethra mucosa, and most likely the paraurethral and prostate glands, are sensitive to simulation, through the two somatic pathways. Stimulation of the vaginal wall automatically stimulates these structures.

How do we distinguish between stimulating the urethra and prostate glands? How do we distinguish between stimulating active prostate glands versus inactive ones? At this time, we can't measure a person's perception of physical events, so these remain unanswerable questions. While we can determine if women have active prostate glands, and to some degree measure nervous activity, we can't measure their perception of them.

It Can't Be That, It Must Be Something Else

Societal attitudes towards urination, and women and their body fluids, basically stipulates urine and urination cannot be a part of the sexual act. This required society to come up with an altogether different explanation for the release of fluid during sex, one that was purely "sexual." You cannot possibly stimulate a woman's urethra, a urinary organ, and experience a sexual response, you must be stimulating her G-Spot, and she can't possibly be releasing fluid from her bladder, so she must be ejaculating fluid from somewhere else. Even if the later meant suggesting glands, in a space the size of a woman's thumb, could produce 2 cups of fluid in 5-10 seconds*.

Would thousands of "female ejaculation" videos be in existence if society had acknowledged the urinary connection from the start? Would men and women be as open to their female partner spraying them with fluid from her bladder, as they are to her ejaculating on them? Especially in absence of scientific evidence indicating they have no control over this?

If the G-Spot and female ejaculation had not come into existence, given social morality, more women would be saying no to sex, for fear of urinating during the activity, and/or more women would be seeking medical correction from their doctors. Even today, we have to wonder if society is ready for the truth!

The Vagina's Role

In the past, the pubococcygial (PC) muscle wasn't commonly believed to play a part in urinary control [3]. It is now believed that it does, by contracting against the vagina, which in turn contracts against the urethra. One means of treating incontinence is to insert a vaginal pessary [6], a plastic device that applies pressure to the vaginal wall, and adjacent urethra. This provides a solution to insufficient pelvic musculature, or compromised nervous control.

This may explain why a woman experienced incontinence during orgasm when her vagina was empty, but not when orgasm occurred while her partner's penis was inserted. Her partner's rigid penis was likely acting as a pessary. Tampons, fingers, and other rigid objects may perform the same role, but not necessarily be safe for long term insertion and use; their use in this manner could result in infection, erosion of vaginal tissues, or further loss of muscle tone.

Since the vagina plays a role in urinary control, we shouldn't be surprised that women experience incontinence and/or female ejaculation during orgasm, as the vaginal and pelvic (PC) muscles are rhythmically contracting and relaxing at this time. If vaginal muscle tone (contraction) decreases momentarily, what prevents urine from flowing through the urethra? In addition, the amount of muscle tissue surrounding the urethra varies considerably between women, and decreases with age, which results in a diverse range of experiences. Men and women don't share the same level of structural control of urination [3], so what is true of men isn't true of women.

While the experience of urination during orgasm could be an indication of incontinence, rather than female ejaculation, I believe it could also be an indication of the diverse range of "normal." I would say there is evidence of a "gray area" between female ejaculation and incontinence, as doctors can sometime stop their occurrence, but not always, and they can't explain why.

The Urinosexual

Women frequently indicate urinary experiences elicit sexual responses (example 1, example 2, example 3), and I believe the reflex arcs [6][11] mentioned above play a role. If a girl or woman experiences a full or over full bladder, to maintain urinary control, necessitates the voluntary or involuntary contraction of the somatic (voluntary) muscles related to increased urinary control. This may trigger reflex arcs (including contraction of muscles surrounding the internal clitoris) and/or stimulate nerves related indirectly or directly to sexual arousal. I believe the body automatically increases the contraction of the smooth (involuntary) muscles of urethra at this time**, applying pressure to the nerves of the prostate [12], paraurethral glands, and urethral mucosa.

Female Pelvic Nerves Somatic Autonomic
The 'yellow spaghetti' in the above illustration represents some of the nerves in the area of the female pelvis that supply the urinary, reproductive, and genital organs. Moving your mouse cursor over the image reveals 'green spaghetti,' which represents the nerves that play a role in blood engorgement during sexual arousal. The manipulation of the overlay image, to match the size and orientation of the base image, has resulted in some distortion, the original images are available here. C = clitoris, VB = vestibular bulb, CCC = clitoris corpus cavernosum, EUS = external urethral sphincter, Va = Vagina, VV/VA = vaginal artery and vein, DCN = dorsal clitoris nerve, IHP = inferior hypogastric plexus; nNOS = neural nitric oxide synthase, SN = spongious nerve, IRP = inferior rectal plexus . [10] [12]

While more commonly associated with the clitoral glans, the autonomic (involuntary) nerves that play a role in blood engorgement are spread throughout the pelvic region, in the area of the clitoris, urethra, vulva, bladder, vagina, and more than likely the female prostate glands [10][12]. If the muscles overlaying the internal clitoris, and possibly the urethra, contract, as a result of a reflex arc or voluntary contraction of pelvic muscles, the resulting stimulation of the nerves internal to the clitoris and urethral complex could trigger blood engorgement.

This may result in activation of the sexual arousal cycle, which is a reflex arc within the region of the pelvis and genitals. Although purely autonomic and involuntary in origin, it may eventually result in the perception of sexual arousal and initiation of sexual desire and activity. The brain doesn't necessarily need to be involved in all of this, on a conscious level, nor have control over it, it just happens, which seems to be the common female experience, from childhood through adulthood.

Note: A full bladder may also displace, apply pressure to, and stretch adjacent sexual and reproductive organs, as demonstrated in these MRI images, stimulating the erogenous zones of the vagina and urethra.

Again, I Just Went!

There is some evidence to suggest female sexual arousal initiates increased urinary output, which means the longer a woman has been sexually aroused, the more fluid there is to release, and the greater the pressure. This would explain why many women indicate they empty their bladder immediately prior to initiating sexual activity yet still ejaculate or experience incontinence.

The Undesired Isn't Necessarily Abnormal

Not to make light of or be dismissive of their experience, or the distress it causes, but female structural anatomy [3] and the experience of aging (decreasing number and density of muscle fibers [4][8] & increased body fat [5]) and childbirth (muscular strain [6]) predisposes women to incontinence, to the degree [7][9] it is expected and therefore normal, from a medical perspective. Momentary incontinence in young women, most often self described as "'insignificant' or non-bothersome" [9], and not all that uncommon, is a possible indication of this predisposition. The prevalence of female ejaculation may be a further indicator.

The social ostracization of "female incontinence" is inappropriate, and results in needless anxiety. If something is a common experience, it is normal. When it comes to female incontinence, society is the one with the problem, not women. This isn't meant to suggest women shouldn't seek out safe and effective means of maintaining their quality of life. Bearing in mind, at this time the consequences of some surgical treatments are not fully understood, and the sexual consequences seems to be the last to be evaluated.

I believe medical science is trying to reengineer the female body to meet society's expectations of it. Society is also telling women they don't necessarily need to, nor in some cases should they, be accepting of "normal", and they don't and aren't, if they have the economic means. This is indicated by the prevalence and range of elective cosmetic surgical procedures available. One of these elective procedures even involves their G-Spot, even before anyone has proven it to be an effective procedure, nor not cause harm.

Part of the problem is society is defining how the female body should look and perform, which sometimes is in opposition to medical knowledge, and the common experience. When the "abnormal" applies to a sizable portion of the population, it it truly normal, but not necessarily economically beneficial to the medical community. Treating the normal as abnormal is often times more economically beneficial than treating the truly abnormal.

Related Information: Early Development of the Male and Female Sexual & Reproductive Organs

Notes:

* As a comparison, I don't believe the more numerous glands inside a breastfeeding woman's breasts are capable of producing and releasing two cups of milk in that short of time. Based on what I have seen in erotic videos featuring women or their partner compressing their breasts and squirting milk from them, the quantity released isn't nearly that great.

** "The innervation and longitudinal orientation of most of the muscle fibres suggest that urethral smooth muscle in the female is active during micturition [urination], serving to shorten and widen the urethral lumen [lining]" to allow passage of urine [8]. If a girl or woman's overly full bladder is trying to automatically empty, it may contract and her urethra dilate to facilitate this, and her (limited) control over urination at this time could be solely dependent on contraction of the voluntary pelvic muscles. The evidence is that young girls would have greater control over urination in this circumstance than older women.

*** In the case of cats, the urethra also dilates, to faciliatate the emptying of the bladder [1].

References:

1. Multiple Pudendal Sensory Pathways Reflexly Modulate Bladder and Urethral Activity in Patients with Spinal Cord Injury, Yoo PB, Horvath EE, Amundsen CL, Webster GD, Grill WM., J Urol. 2011 Feb;185(2):737-43.

2. Innervation of the Female Human Urethral Sphincter: 3D Reconstruction of Immunohistochemical Studies in the Fetus, Ibrahim Karam, Stéphane Droupy, Issam Abd-Alsamad, Jean-François Uhl, Gérard Benoît, Vincent Delmas, European Urology 47 (2005) 627–634

3. The Anatomical Components of Urinary Continence, Christian Wallner A, Noshir F. Dabhoiwala B, Marco C. DeRuiter c, Wouter H. Lamers, European Urology Volume 55, issue 4, pages 761-1002, April 2009

4. Age effects on urethral striated muscle. I. Changes in number and diameter of striated muscle fibers in the ventral urethra, Perucchini D, DeLancey JO, Ashton-Miller JA, Peschers U, Kataria T, Am J Obstet Gynecol. 2002 Mar;186(3):351-5.

5. Body mass index, urinary incontinence, and female sexual dysfunction: how they affect female postmenopausal health, Pace G, Silvestri V, Gualá L, Vicentini C., Menopause. 2009 Nov-Dec;16(6):1188-92.

6. Stress Urinary Incontinence, Bent, A, McBride, A, Glob. libr. women's med., (ISSN: 1756-2228) 2008; DOI 10.3843/GLOWM.10060 January 2008 (Online Web Article)

7. Variation in estimates of urinary incontinence prevalence in the community: effects of differences in definition, population characteristics, and study type, Thom D., J Am Geriatr Soc. 1998 Apr;46(4):473-80.

8. Gross Anatomy and Cell Biology of the Lower Urinary Tract, J. Delancy, J. Gosling (Online PDF)

9. The Prevalence of Urinary Incontinence, Victor W Nitti, MD, Rev Urol. 2001; 3(Suppl 1): S2–S6.

10. Neural Supply to the Clitoris: Immunohistochemical Study with Three-Dimensional Reconstruction of Cavernous Nerve, Spongious Nerve, and Dorsal Clitoris Nerve in Human Fetus, David Moszkowicz, MD, Bayan Alsaid, MD, Thomas Bessede, MD, Mazen Zaitouna, MD, Christophe Penna, MD, Gérard Benoit, MD, and Frédérique Peschaud, MD, J Sex Med 2011;8:1112–1122

11. Diagnostic Procedures in the Evaluation of Female Urinary Incontinence and Voiding Dysfunction, Sand, P, Glob. libr. women's med.,(ISSN: 1756-2228) 2008; DOI 10.3843/GLOWM.10055 (Online Web Article)

12. Coexistence of adrenergic and cholinergic nerves in the inferior hypogastric plexus: anatomical and immunohistochemical study with 3D reconstruction in human male fetus, Bayan Alsaid, Thomas Bessede, Ibrahim Karam, Issam Abd-Alsamad, Jean-Francois Uhl, Gérard Benoît, Stéphane Droupy and Vincent Delmas, J. Anat. (2009) 214 , pp645–654

13. Effect of urethral dilation on vesical motor activity: identification of the urethrovesical reflex and its role in voiding. Shafik A, el-Sibai O, Ahmed I., J Urol 2003;169:1017.