The Biological Reality of Why We Move Past Binary Labels
We often grow up thinking that biological sex is a simple coin flip. Heads or tails, pink or blue, girl or boy. Except that nature doesn’t actually work in binary code, and the thing is, most people don’t think about this enough until they are forced to confront a medical chart that doesn't make sense. When someone asks what is it called when a person has both guy and girl parts, they are usually looking for a single diagnosis, but the reality is a sprawling map of chromosomal, gonadal, and hormonal diversities. Roughly 1.7 percent of the population is born with intersex traits, a figure that makes being intersex about as common as having red hair, which really puts the "rarity" argument into perspective.
The Problem With Old Terminology
Language evolves because it has to. For decades, the term "hermaphrodite" was the standard, rooted in Greek mythology, but it carries a heavy load of botanical baggage that doesn't apply to human beings. Humans are not capable of functioning as both sexes simultaneously in a reproductive sense—a biological impossibility in our species—so the word is misleading at best and offensive at worst. Today, the medical community prefers Disorders of Sex Development (DSD), though many activists and patients find the word "disorder" implies something is broken that needs fixing. I think we need to be careful with how we pathologize variation; if a body functions perfectly well but just looks different, calling it a disorder feels like a value judgment disguised as a diagnosis.
But wait, is it just about what you see? Not even close. You could go your entire life with what you assume are standard "guy parts" only to find out during a routine hernia surgery that you have a persistent Müllerian duct and a fully formed uterus tucked away inside. That changes everything about how we define the self.
Diving Into the Mechanics of Chromosomal and Hormonal Variations
The blueprint usually starts with chromosomes—XX for female, XY for male—but sometimes the printer jams or runs a different script entirely. There are people with XXY (Klinefelter syndrome), others with X (Turner syndrome), and even individuals who are chromosomal mosaics, meaning some cells in their body have one set of chromosomes while other cells have a different pair. Imagine a quilt where some patches are wool and others are silk; the body is still a cohesive whole, yet it contains different underlying instructions. This isn't a "glitch" so much as it is a diversified genetic expression that bypasses the standard 46,XX or 46,XY expectation.
The Role of Androgens in Physical Development
Hormones do the heavy lifting during fetal development, acting like chemical foremen telling the body where to build what. In cases of Androgen Insensitivity Syndrome (AIS), a person might have XY chromosomes and internal testes, but their body’s receptors simply ignore the testosterone being produced. Because the body can’t "hear" the male signal, it defaults to developing female external characteristics. As a result: an individual is born looking like a typical girl, is raised as a girl, and often only discovers their XY status when menstruation fails to start in their teens. It’s a staggering reminder that what is it called when a person has both guy and girl parts often depends entirely on which level of biology—chromosomes, hormones, or anatomy—you choose to look at first.
And then we have Congenital Adrenal Hyperplasia (CAH). In these instances, an XX fetus is exposed to high levels of masculinizing hormones in the womb, which can result in ambiguous genitalia that appears to be a blend of both sexes. Is it a medical emergency? Rarely. But historically, doctors rushed to "correct" these parts with surgery before the child could speak for themselves, a practice that is now under intense ethical scrutiny worldwide.
The Spectrum of Gonadal Dysgenesis and Internal Structures
Where it gets tricky is when we look at the gonads themselves. In a condition known as Ovotesticular Intersex, a single person may actually possess both ovarian and testicular tissue. This might happen in separate gonads (one ovary and one testis) or in a combined organ called an ovotestis. This is perhaps the closest biological manifestation to the literal question of having "both parts," yet even here, the external appearance can vary wildly from looking completely male to completely female or somewhere in the middle.
Ambiguous Genitalia at Birth
When a baby is born and the obstetrician hesitates to announce the sex, the medical team usually refers to it as ambiguous genitalia. This isn't a diagnosis in itself, but a clinical observation. The phallus might be a size that sits between a clitoris and a penis, or the labia might be partially fused, resembling a scrotum. In the past, doctors used the Prader Scale or the Quigley Scale to "measure" sex, which feels incredibly reductive when you consider the complexity of a human life. We’re far from the days when a surgeon could just "pick a side" and expect the person’s identity to follow suit without complication. The issue remains that surgical intervention often prioritizes cosmetic conformity over future sexual sensation or fertility.
Comparing Intersex Realities to Gender Identity
It is a common mistake to conflate being intersex with being transgender, yet the two are fundamentally different categories of human experience. Intersex refers to biological traits—the hardware, if you will—while transgender refers to gender identity, which is the internal sense of being a man, woman, or another gender. A person can be intersex and identify as a man, a woman, or non-binary, just like anyone else.
The Distinction Between Body and Self
Think of it this way: intersex is about what your body is, while transgender is about who you are. While some intersex people do identify as gender-diverse because their bodies don't fit the binary, many others are perfectly comfortable identifying as the sex they were assigned at birth. Yet, the medicalization of intersex bodies often mirrors the struggles faced by the trans community, specifically regarding the right to bodily autonomy and the freedom from forced medical procedures. In short, both groups challenge the idea that "man" and "woman" are two boxes that everyone must fit into neatly, but they do so from different starting points. Experts disagree on how much these two paths overlap, but for the individual living the experience, the nuances of the "what is it called when a person has both guy and girl parts" conversation are deeply personal and often fraught with historical trauma.
Because we live in a society obsessed with categorization, we tend to force these complex biological realities into simple definitions. But honestly, it's unclear why we are so afraid of the middle ground. Nature loves variety; it's only humans who seem to have a problem with it.
Lethal Assumptions and Semantic Blunders
The Hermaphrodite Misnomer
Language evolves, yet old ghosts linger. The term hermaphrodite persists in dusty textbooks and crude jokes, but for the medical community and the intersex population, it is a relic. We must abandon it. The problem is that the word implies a functional duality—the ability to be both a biological father and mother—which is a biological impossibility in humans. In the animal kingdom, snails pull this off with flair. Humans do not. When a person has both guy and girl parts, they are navigating a complex congenital divergence, not acting as a mythological hybrid. Using the H-word today is effectively a linguistic slap in the face. It reduces a person’s entire physical reality to a sideshow trope. As a result: clinicians now use Disorders of Sex Development (DSD) or, more humanely, intersex variations.
Gender is Not the Genitalia
Do not confuse a chromosome with a personality. A common error involves assuming that an intersex diagnosis dictates gender identity. It does not. Because a child is born with ambiguous genitalia or mosaic genetics, society feels a frantic need to "fix" the ambiguity. Let's be clear: having a physical variation does not mean the person is non-binary or trans by default. Many individuals with these traits identify strongly as men or women. Others do not. The issue remains that we often prioritize the comfort of the observer over the autonomy of the individual. We rush to categorize. We panic at the sight of an ovotestis. But a person’s sense of self is a psychological architecture, while their biological sex characteristics are merely the building materials.
The Hidden Trauma of Pediatric Intervention
The Ethics of the Scalpel
There is a darker corner of this field that rarely sees the light of mainstream media. For decades, the standard of care involved corrective surgery on infants. Doctors aimed to make the "guy and girl parts" conform to a binary standard before the child could even speak. This was often done without the parents fully grasping the long-term impact on sexual sensation or future fertility. We have data on this now. Studies suggest that up to 20% of individuals who underwent these early "normalizing" surgeries later regretted the procedures. The trauma is visceral. It is a theft of agency. Except that the tide is finally turning. High-level human rights organizations now categorize non-consensual intersex surgeries as a form of genital mutilation. (And yes, that is a heavy term to use in a clinical setting). We are seeing a shift toward delaying intervention until the patient can participate in the decision. Which explains why advocacy groups like interACT are gaining such massive legal traction in the 2020s. Expert advice is simple: if it isn't a medical emergency, put the scalpel down. Wait. Listen.
Frequently Asked Questions
Is being intersex a rare occurrence?
You might think these variations are statistical outliers, but they are more common than most realize. The frequently cited figure from researchers like Anne Fausto-Sterling suggests that roughly 1.7% of the global population is born with intersex traits. To put that in perspective, that is approximately the same percentage of people born with natural red hair. This data encompasses everything from subtle hormonal variations to visible genital ambiguity. It is not a fringe phenomenon. In a world of 8 billion people, millions live with what some call having both guy and girl parts, though they may never even know it without a genetic test.
Can these individuals have children?
Fertility is a spectrum within this community, not a binary "yes" or "no." For instance, individuals with Complete Androgen Insensitivity Syndrome (CAIS) typically have an XY (male) chromosome set but develop female external features; they generally cannot conceive as they lack a uterus. Conversely, those with certain forms of Congenital Adrenal Hyperplasia (CAH) may have functional ovaries and can carry a pregnancy with hormonal support. Statistics show that fertility preservation is now a major focus in DSD clinics. Yet, the path to biological parenthood often requires Assisted Reproductive Technology (ART). Each case is a unique puzzle of anatomy and endocrinology.
Are intersex traits always visible at birth?
Physical appearance is a deceptive metric. Many people assume a person has both guy and girl parts only if the external genitalia are "mixed," but many variations stay hidden until puberty. A teenager might seek medical help because they haven't started menstruating, only for an ultrasound to reveal internal testes instead of a uterus. This is frequently the case with 5-alpha reductase deficiency. In other instances, a person may live their entire life, have children, and die without ever realizing they have chimerism or a chromosomal mosaicism. Nature is messy. It does not always announce its complexity on the delivery table.
Beyond the Binary Brink
The obsession with neat boxes is a failure of our collective imagination. When we ask what it is called when a person has both guy and girl parts, we are really asking how much biological diversity we are willing to tolerate. Let's stop pathologizing the natural variation of the human species. My position is firm: we must protect bodily integrity above all else. Surgeons should not be architects of social conformity. Is it so difficult to exist in a world where a body doesn't have to be a polarized map? We owe these individuals more than just a label; we owe them the right to be whole, unaltered, and unashamed. In short, the future of medicine isn't about fixing "broken" bodies, but about fixing our broken definitions of normal.