The most widely used and respectful term is “transgender woman” or “trans woman,” referring to someone whose gender identity is female but whose body includes a penis. In some cases, the person may have an intersex condition, meaning their anatomy developed atypically before birth due to variations in chromosomes, hormones, or reproductive organs. The terminology people use for themselves varies, and the reasons someone identifies as female while having a penis span a range of biological, psychological, and social realities that are worth understanding clearly.
What “Transgender Woman” Actually Means
A transgender woman is someone who was assigned male at birth based on their genital anatomy but identifies and lives as a woman. The term says nothing specific about whether the person has had surgery, takes hormones, or has altered their body in any way. Many transgender women retain their birth anatomy for a variety of reasons, including personal preference, medical considerations, or financial barriers to surgery. Having a penis does not make someone “less” of a trans woman, and the assumption that all transgender people pursue surgical transition is one of the most persistent misconceptions about this population.
The terminology itself has evolved. The word “transgender” came into common use in the 1970s, gradually replacing older clinical terms like “transsexual,” which had been popularized by the physician Harry Benjamin in the mid-twentieth century.1PubMed Central. How gender dysphoria and incongruence became medical diagnoses – a historical review Today, “transgender woman” or simply “trans woman” is the standard term in both medical literature and everyday language. You will sometimes see the abbreviation “trans femme” in community spaces, which is a broader umbrella that also includes nonbinary people who lean toward feminine expression.
Intersex Conditions and Atypical Anatomy
Not every girl or woman with a penis is transgender. Some are born with intersex conditions, where their chromosomes, hormones, or reproductive anatomy do not fit neatly into the typical categories of male or female. These are distinct from being transgender, though the two can overlap in some individuals.
One well-known example is congenital adrenal hyperplasia (CAH), a condition in which the adrenal glands produce excess androgens. In people with XX chromosomes (typically female), this can cause the external genitalia to appear more masculine, including significant clitoral enlargement that may resemble a small penis. A study of 34 patients with CAH found clitoral lengths ranging from 1.9 to 5.0 centimeters, and most had a single perineal opening rather than the typical separate urethral and vaginal openings.2SciELO – Clinics. Anatomical and functional outcomes of feminizing genitoplasty for ambiguous genitalia in patients with virilizing congenital adrenal hyperplasia These individuals are genetically female, have ovaries and a uterus, but their external anatomy can look ambiguous or male-typical at birth.
Another condition is 5-alpha reductase deficiency. People with this condition have XY chromosomes but lack the enzyme that converts testosterone into its more potent form during fetal development. As a result, their genitals may appear female or ambiguous at birth, and they are often raised as girls. At puberty, rising testosterone levels can cause virilization, including growth of what was thought to be a clitoris into a phallus. A study of six patients with this condition who were raised female found that four continued to identify as female, one identified as male, and one identified as both genders.3PubMed. Gender identity in patients with 5-alpha reductase deficiency raised as females In a separate report of four adolescents with the same deficiency, all had been raised as girls and showed virilization of their external genitalia during puberty.4Fertility and Sterility. Primary amenorrhea in four adolescents revealed 5α-reductase deficiency confirmed by molecular analysis
A third category is androgen insensitivity syndrome (AIS), where the body’s cells cannot respond to androgens. In complete AIS, a person with XY chromosomes develops female external genitalia and is typically raised as a girl, often discovering the condition only when puberty does not proceed as expected. In partial AIS, the picture is more varied: the genitalia can range from mostly female to mostly male depending on how much androgen sensitivity remains. Partial AIS is characterized by a range of genital presentations and requires careful assessment to determine the best course of care.5Archives of Medical Science. The challenges of androgen insensitivity syndrome 6PubMed. Correlation between genotype, phenotype and sex of rearing in 111 patients with partial androgen insensitivity syndrome
Why a Penis and a Clitoris Are Not as Different as You Think
One reason these variations exist is that penile and clitoral tissue share the same embryonic origin. Early in fetal development, all embryos have a structure called the genital tubercle. Whether it develops into a penis or a clitoris depends on hormonal signals, primarily the presence or absence of androgens like testosterone.7PubMed Central. Development of the human penis and clitoris 8PubMed Central. Development of the external genitalia: conserved and divergent mechanisms of appendage patterning If hormone levels fall between the typical ranges, or if the tissue responds differently than expected, the result can be anatomy that does not fit neatly into either category.
This shared developmental pathway is why intersex conditions produce such a wide spectrum of anatomy. It is not a matter of something “going wrong” in a simple sense. The underlying biology is flexible, and small shifts in hormone levels or receptor sensitivity during a narrow window of fetal development can produce very different anatomical outcomes from the same starting tissue.
What Brain Research Shows About Gender Identity
A common question people have is whether there is a biological basis for someone identifying as female despite having male-typical anatomy. Research on brain structure has started to offer some clues, though the science is still developing. A study using brain imaging of transgender women who had not yet begun hormone therapy found that their brain structure fell between those of cisgender men and cisgender women, significantly different from both groups.9PubMed Central. Brain Sex in Transgender Women Is Shifted towards Gender Identity This suggests that gender identity has some basis in brain anatomy that is not simply determined by genital sex.
A larger analysis pooling data from multiple studies added complexity to that picture. Rather than finding that transgender brains simply look like the gender they identify with, the researchers found that transgender individuals showed a distinct pattern, not a simple shift from one end of a male-female spectrum to the other.10PubMed. The Neuroanatomy of Transgender Identity: Mega-Analytic Findings From the ENIGMA Transgender Persons Working Group A separate study also found that brain scans of transgender women were more frequently misclassified by sex-prediction algorithms, meaning their brain structure did not fit neatly into the expected “male” pattern.11Neuropsychopharmacology. Biological sex classification with structural MRI data shows increased misclassification in transgender women
None of this research proves that gender identity is “hardwired” in a simple way. The brain is influenced by both biology and experience. But the accumulating evidence does indicate that gender identity is not just a social preference or a whim. It has measurable biological correlates that exist before any hormone therapy or social transition.
Why the Right Words Matter
Terminology is not just a matter of politeness. Research consistently links the use of a person’s correct name and pronouns to better mental health outcomes. A study of transgender youth found that using a young person’s chosen name across multiple settings (home, school, work, and with friends) predicted substantially lower rates of depressive symptoms, suicidal thoughts, and suicidal behavior. Each additional context where the chosen name was used predicted a 29% decrease in suicidal ideation and a 56% decrease in suicidal behavior.12PubMed Central. Chosen Name Use is Linked to Reduced Depressive Symptoms, Suicidal Ideation and Behavior among Transgender Youth
Correct pronoun use matters on a similar level. Research on transgender women found that being addressed with correct pronouns, consistent with their gender identity, was linked to better mental health outcomes across several measures.13PubMed Central. Gender Affirmation through Correct Pronoun Usage: Development and Validation of the Transgender Women’s Importance of Pronouns (TW-IP) Scale Calling a trans woman by male terms or treating her anatomy as defining her gender is not a neutral act. For many people, it directly undermines their psychological wellbeing.
This is worth keeping in mind when encountering the question in this article’s title. The phrasing “a girl with a penis” is sometimes used casually or crudely, but the person it describes is, in most cases, simply a woman or girl. Reducing someone to a description of their genitals misses the point entirely. Whether someone is a trans woman, an intersex woman, or a nonbinary person who uses different terms altogether, the respectful approach is to use the language they use for themselves.
Terms You Might Encounter and What They Mean
Because this topic sits at the intersection of medicine, identity, and community culture, you will encounter a range of terms. Here are the ones most likely to come up:
- Trans woman: A person assigned male at birth who identifies as a woman. She may or may not have had any medical interventions.
- Intersex: A person born with sex characteristics (chromosomes, hormones, anatomy) that do not fit typical definitions of male or female. This is a biological category, not a gender identity.
- Nonbinary: Someone whose gender identity falls outside the strict male/female binary. Some nonbinary people have anatomy that others might describe with the title question’s framing, but many would not describe themselves as “a girl with a penis” at all.
- Pre-op/non-op: Informal terms sometimes used to describe a transgender person who has not had or does not plan genital surgery. These terms can feel reductive, and many trans people dislike them because they center the conversation on genitalia rather than identity.
- Gender nonconforming: A broad term for anyone whose gender expression differs from social expectations. It does not necessarily imply anything about anatomy.
Community-specific slang also exists and varies dramatically across cultures and languages. Research on transgender communities in Indonesia, for example, documented how local slang is formed by blending syllables from Javanese and Indonesian languages with new affixes or substitutions.14Register Journal. Transgender Community and Its Slang Words In other cultures, terms like “hijra” (South Asia), “fa’afafine” (Samoa), or “muxe” (Zapotec communities in Mexico) describe people who occupy gender roles outside the Western binary. These categories have deep cultural histories and do not map neatly onto Western terms like “transgender.”
Medical Pathways Are Not Required
A persistent assumption is that being a “real” trans woman requires medical transition, especially genital surgery. This is not the case, either socially or medically. The World Professional Association for Transgender Health’s Standards of Care (now in their eighth version) address a wide range of populations and treatment options, emphasizing individualized care rather than a one-size-fits-all protocol.15PubMed Central. Standards of Care for the Health of Transgender and Gender Diverse People, Version 8
For those who do pursue surgical options, the most common procedure for trans women is penile inversion vaginoplasty, in which penile tissue is used to create a vaginal canal.16PubMed Central. Penile Inversion Vaginoplasty: An Evolving Technique An alternative called vulvoplasty creates the external appearance of a vulva without a vaginal canal. Research has found that most patients who chose vulvoplasty did so by preference rather than because vaginoplasty was medically ruled out.17The Journal of Sexual Medicine. Does Depth Matter? Factors Affecting Choice of Vulvoplasty Over Vaginoplasty as Gender-Affirming Genital Surgery for Transgender Women When comparing techniques for vaginoplasty itself, patients weigh factors including expected vaginal depth, the possibility of natural lubrication, and perceived complication risks.18Transgender Health. A Mixed-Methods Analysis of Patient Decision-Making Between Penile Inversion and Robotic Peritoneal Vaginoplasty
For younger transgender individuals, medical guidelines take a staged approach. Before puberty, no medical intervention is recommended. Once puberty begins, puberty-blocking medications can be used to pause development, giving the young person time to explore their identity before irreversible changes occur. After puberty, hormone therapy becomes an option.19PubMed Central. Gender affirming medical care of transgender youth Surgery is typically reserved for adults or older adolescents after careful evaluation.
The point is that many trans women live full, affirmed lives without ever changing their anatomy. Whether someone pursues hormones, surgery, both, or neither does not determine the validity of their identity. The question of “what to call” someone does not depend on what their body looks like underneath their clothes.
How Media Shapes Public Understanding
The reason many people even encounter the framing in this article’s title is media. Transgender people have gained far more visibility in news, entertainment, and social media over the past decade, and that visibility has shaped how the public thinks about trans identities. Research involving interviews with transgender and gender diverse individuals found that increased media representation played a meaningful role in both public awareness and individual identity discovery. Participants described how seeing people like themselves in media helped them understand and articulate their own experiences.20PubMed Central. The Rise of Transgender and Gender Diverse Representation in the Media: Impacts on the Population
But that visibility has a downside. Media representation of trans women frequently fixates on their bodies, particularly their genitals, in a way that would be considered bizarre and invasive if applied to cisgender people. Interview segments asking trans women about their surgical status, tabloid headlines speculating about anatomy, and the very search query behind this article all reflect a cultural tendency to reduce trans women to a perceived mismatch between identity and body parts. Better media representation would treat trans women the way it treats everyone else: as people whose medical histories are their own business.
The Difference Between Identity and Passing
Research with binary and nonbinary transgender adults has explored how the concepts of “passing” (being perceived by others as one’s identified gender) and “blending” (moving through public spaces without drawing attention to one’s trans status) affect daily life. Binary trans women and nonbinary individuals described these experiences very differently, with binary trans women placing more weight on consistent recognition as female in social settings, while nonbinary participants navigated a more complex landscape where no single mode of being perceived felt entirely right.21PubMed Central. Navigating identity: Experiences of binary and non-binary transgender and gender non-conforming (TGNC) adults
For a trans woman with a penis, the question of passing often centers on contexts where anatomy might become relevant, such as intimate relationships, medical settings, or changing rooms. But in the vast majority of daily life, her anatomy is invisible and irrelevant to how she should be addressed or treated. The gap between public curiosity about trans women’s bodies and the actual significance of anatomy in everyday interaction is enormous. Most of the time, what someone has in their pants matters exactly as much as what anyone else has in theirs, which is to say, not at all.
Intersex and Transgender Are Not the Same Category
One common source of confusion is conflating intersex conditions with being transgender. They are fundamentally different. Intersex conditions are variations in physical sex development, present from birth. Being transgender is about gender identity, the internal sense of being male, female, or something else, which may or may not align with one’s body. An intersex person may also be transgender, but most are not. Similarly, most transgender people are not intersex.
The distinction matters practically. Intersex advocacy organizations have long pushed back against unnecessary surgical interventions performed on intersex infants to make their genitals look more typically male or female. The CAH study cited earlier in this article reported that while most surgical outcomes were rated as good, over a fifth of patients experienced complications including bleeding and tissue death.2SciELO – Clinics. Anatomical and functional outcomes of feminizing genitoplasty for ambiguous genitalia in patients with virilizing congenital adrenal hyperplasia Intersex advocates argue that these surgeries are often performed before the child can consent, and that waiting until the person is old enough to participate in the decision would be more ethical. Transgender healthcare, by contrast, centers on affirming an identity the person has articulated for themselves.
Both groups benefit from a world that is less fixated on sorting every body into one of two rigid categories. But their medical needs, advocacy priorities, and personal experiences are distinct enough that lumping them together does neither group any favors.