How Many Holes Do Girls Have? 3 Openings Explained

Girls and women have three separate openings in the area between their legs: the urethral opening, the vaginal opening, and the anus. Two of those three sit very close together within a small region called the vestibule, which is why many people assume there are only two. Research on adolescent health literacy has found that few young people can correctly identify where urine exits the body or how many openings the vulva contains, so the confusion is widespread and worth clearing up.

Where Each Opening Is Located

All three openings are arranged in a line running from front to back. At the front, just below the clitoris, is the urethral opening, the tiny hole through which urine leaves the body. A short distance behind it is the vaginal opening, which is larger and serves as the passage for menstrual blood, sexual intercourse, and childbirth. Farther back still, past a bridge of tissue called the perineal body, is the anus, the opening at the end of the digestive tract.

The first two openings, the urethral and vaginal, both sit inside a shallow depression known as the vestibule. The vestibule is bordered on each side by the inner lips (labia minora) and stretches from just below the clitoris down to the back edge of the vaginal opening.¹ A surgical anatomy study describes the vestibule as the area that “contains the openings of the vagina, urethra, and the ducts of the greater vestibular glands.”² Those gland ducts are tiny and not visible without close inspection, so for all practical purposes the vestibule houses two main openings: the urethral one and the vaginal one.

The anus, by contrast, is entirely separate. It sits behind the perineal body, a dense wedge of muscle and connective tissue that acts as an anchor point between the vaginal and anal canals. Even in cases where the perineal body is severely damaged or completely absent after childbirth injury, the vaginal and anal openings remain distinct structures.³

Why the Urethral Opening Is So Easy to Miss

The single biggest reason people think girls have only two openings is that the urethral opening is small and hard to see. In adult women, the urethra is only about 3 to 4 centimeters long, and the external opening can be as small as a few millimeters across. A study measuring urethral length in girls found an average of about 26 millimeters, with a range from 12 millimeters in a young child to 40 millimeters in a teenager.⁴ Because the tube is short and the opening is tucked between folds of tissue, you can look directly at the area and still not realize it is there.

By comparison, the vaginal opening is much more obvious. In someone who has gone through puberty, it is large enough to be visually identified, especially if the labia are gently parted. The anus is similarly easy to locate. The urethral opening sits between these two more prominent landmarks and often blends in with the surrounding pink mucosal tissue. Many women go their entire lives without ever seeing their own urethral opening, which is completely normal but contributes to the widespread belief that urine exits through the vagina.

Why So Many People Get This Wrong

The misconception that girls have two openings rather than three is not a sign of carelessness. It reflects genuine gaps in how anatomy is taught. A study evaluating pelvic health education in schools found that baseline knowledge of pelvic anatomy among adolescent girls was minimal, with very few able to correctly identify where urine exits the body or how many openings the vulva has.⁵ If the people who own the anatomy struggle to identify its parts, it makes sense that everyone else does too.

Part of the problem is that sex education classes tend to focus on reproduction, which emphasizes the vagina and uterus while glossing over the urinary system. Diagrams in textbooks often show a simplified side view that makes the urethra look like a labeled line rather than a real structure with its own opening. And cultural discomfort around discussing genitalia means that many parents and teachers avoid the topic altogether, leaving children to piece things together from incomplete information.

Even the medical literature has contributed to confusion. A structured review of published research on the anatomy of the front part of the female pelvis identified 67 unique anatomical structures, many of which had inconsistent naming across different papers and textbooks.⁶ When researchers themselves use different terms for the same structures, the confusion inevitably trickles down to everyone else.

What Each Opening Actually Does

The three openings serve completely independent functions, which is why they exist as separate passages in the first place.

Urethral opening: This is the exit point for urine. The urethra connects to the bladder and does nothing else. It is not involved in reproduction or digestion.
Vaginal opening: This leads to the vaginal canal, which connects to the cervix and uterus. It serves as the passage for menstrual flow leaving the body, for penetrative sexual activity, and for childbirth. Tampons and menstrual cups sit inside this canal.
Anus: The end of the gastrointestinal tract. Stool leaves the body here. It is anatomically and functionally separate from the urinary and reproductive systems.

A common follow-up question is whether urine can come out of the vagina. Under normal anatomy, the answer is no. The urethral and vaginal openings are distinct, and each connects to a completely different internal system. The bladder drains through the urethra; the uterus drains through the vagina. The only situation where urine might exit through the vaginal canal is if a fistula, an abnormal connection between the bladder and vagina, has formed, usually as a result of difficult childbirth, surgery, or certain medical conditions. This is a recognized complication, not normal anatomy.

How These Three Openings Form Before Birth

Early in embryonic development, there is actually only one shared opening. Between roughly the fourth and seventh weeks of pregnancy, a structure called the cloaca, which initially receives the urinary, reproductive, and digestive tracts all at once, divides into separate compartments.⁷ The hindgut (future rectum and anus) separates from the urogenital sinus (future bladder, urethra, and vaginal structures). Later in development, the urogenital sinus further differentiates so that the urinary and reproductive tracts gain their own openings.

This developmental sequence explains why, across the animal kingdom, the number of openings varies so much. In some mammals, the urinary and genital tracts share a single external opening for the animal’s entire life. In humans, the tracts separate almost completely, leaving just a very short shared vestibule where both the urethral and vaginal openings sit side by side.⁸ The degree of separation varies enormously from species to species, but in humans the result is three clearly distinct openings.

When the Anatomy Differs From the Standard Three

Not everyone is born with three neatly separated openings. Congenital variations in how the cloaca divides can produce a range of anatomical differences, some of which are discovered at birth and others not until puberty.

One group of conditions involves the urogenital sinus failing to fully separate. When this happens, the urethral and vaginal tracts may share a single external opening instead of having two. These abnormalities often present as ambiguous external anatomy or may cause a buildup of fluid behind the shared passage.⁹ In many cases, the underlying cause is congenital adrenal hyperplasia, a hormonal condition that affects genital development. Surgical correction can usually create separate functional openings.

Another set of variations involves the vagina itself being absent or blocked. Some people are born without a vaginal canal, or with a vaginal septum (a wall of tissue that partially or completely divides the canal). These conditions may not become apparent until a teenager notices that periods never arrive or that a tampon cannot be inserted. A retrospective study of congenital genital tract anomalies found that surgical treatment was often scheduled around age 16 to 18, timed to when organs were more fully developed and the person was nearing the expected start of sexual activity.¹⁰ In such cases, the surgical plan was designed around each person’s specific existing anatomy.

These variations are relatively uncommon, but they are worth knowing about because they challenge the assumption that all female bodies look and function the same way. Someone with a persistent urogenital sinus may functionally have two openings rather than three, and someone born without a vaginal canal may appear to have only two until surgical intervention creates a third.

How the Anatomy Changes Over a Lifetime

The three openings are present from birth, but the tissues surrounding them change significantly at different life stages. During childhood, the vulvar and vaginal tissues are thin and have relatively little blood supply. At puberty, rising hormone levels trigger a series of changes: the labia grow, the vaginal lining thickens, and the tissues of the vestibule become more vascular and resilient.¹¹ These changes happen in a predictable sequence driven by adrenal and gonadal maturation.

After menopause, falling estrogen levels reverse some of those changes. The vaginal lining thins again, the tissues become drier, and the urethral opening can become more prominent or more prone to irritation. None of these changes alter the number of openings, but they can make one or more of them look or feel different than they did during reproductive years. The anus, being part of the digestive system rather than the reproductive system, is less affected by these hormonal shifts, though the perineal body and surrounding muscles can weaken with age.

The Nerve Supply Around the Vestibule

The vestibule, the area housing the urethral and vaginal openings, is one of the most richly supplied nerve regions in the body. Research has identified multiple types of nerve fibers running through this tissue, including fibers that detect pain, pressure, and temperature, along with fibers from the sympathetic and parasympathetic nervous systems.¹² These nerve endings have been confirmed through tissue sampling in both living patients and cadaveric specimens.¹³

This dense nerve supply explains why the vestibular area is so sensitive to touch, and also why conditions affecting it can be so painful. Vestibulodynia, for instance, is a condition where the tissue around the vaginal opening becomes chronically painful, sometimes to the point where wearing tight clothing or sitting for long periods becomes difficult. Understanding that this area is packed with sensory nerve endings helps explain why problems there feel so disproportionately intense compared to the size of the tissue involved.

Practical Implications for Hygiene and Health

Knowing that there are three separate openings matters for basic hygiene. The standard advice to wipe from front to back exists specifically because the urethral opening, vaginal opening, and anus are arranged in that order. Bacteria from the anus can cause urinary tract infections if they migrate forward to the urethral opening, and the short length of the female urethra makes this migration easier than it would be in male anatomy.

When inserting a tampon, menstrual cup, or medication, the vaginal opening is the correct target, not the urethral opening (which is too small for these anyway, though the confusion leads some people to aim too far forward). If you are helping a child learn to use the bathroom independently, knowing that urine comes from a separate opening than the one associated with periods can help you explain things more accurately. Similarly, during medical exams, understanding that the urethral opening exists as a distinct structure helps you make sense of what a clinician is examining and why.

For parents teaching young children about their bodies, the simplest accurate explanation is that there are three openings: one for pee, one connected to the uterus, and one for poop. This avoids the common pitfall of letting children believe urine comes from the vagina, a misconception that can persist well into adulthood if it is never corrected. Given how poor baseline anatomical knowledge tends to be among adolescents, early and accurate language gives children a meaningful head start.⁵

How Surgical Reconstruction Relates to These Openings

The three-opening anatomy sometimes needs to be surgically created, restored, or modified. In addition to the congenital conditions discussed earlier, gender-affirming surgery for transgender women involves constructing a vulva with functional anatomy. Vaginoplasty procedures create a vaginal canal, a urethral opening for urination, and a vulvar appearance that includes labia and a clitoris. The anus, being part of the digestive system, is already present and is not part of the genital reconstruction.¹⁴

Reconstructive surgery after traumatic injury or cancer treatment may also involve restoring the separation between these openings. The perineal body, which acts as the dividing wall between the vaginal and anal openings, can be torn during childbirth, sometimes severely enough that the two openings partially merge. Surgical repair aims to rebuild that partition and restore each opening’s independence. The external anatomy of the vulva, including the structures that frame all three openings, consists of the mons pubis, labia, clitoris, and the vestibule with its glands, all of which can be addressed in reconstructive procedures.¹⁵

The fact that surgeons can successfully reconstruct this anatomy reinforces how well-defined the three openings are as separate structures. They are not vague zones that blur into each other. Each has its own walls, its own lining, and its own connection to an internal organ system, which is exactly what makes it possible to repair or create them independently when needed.