The word “hermaphrodite” suggests a body carrying a complete set of male and female sex organs, but in humans, that picture is misleading. No documented case exists of a person with a fully developed penis and fully developed vagina both present and fully functional. What does exist is a spectrum of conditions, now grouped under the medical umbrella “differences of sex development” (DSD), in which a person’s chromosomes, internal reproductive organs, or external genitalia don’t line up in the typical male or female pattern. The biology is real and well-studied, but it rarely looks the way most people imagine.
Why Doctors Stopped Using the Word “Hermaphrodite”
For most of medical history, the term “true hermaphrodite” was applied to people who had both ovarian and testicular tissue in their bodies. Other intersex conditions were labeled “pseudohermaphroditism.” In 2005, an international consensus group recommended dropping these terms entirely because they carried stigma and caused confusion. The replacement term, “disorders of sex development” (DSD), was adopted to cover the full range of conditions in which chromosomal, gonadal, or anatomical sex development follows an atypical path.1PubMed Central. Consensus statement on management of intersex disorders Many intersex advocacy groups have since pushed further, preferring “differences of sex development” to avoid the pathologizing connotation of “disorders.” The older terminology still circulates in popular searches and older medical texts, which is partly why the question “does a hermaphrodite have both genitalia?” persists.
Ovotesticular DSD, the Condition Closest to the Traditional Idea
The condition formerly called “true hermaphroditism” is now known as ovotesticular DSD. A person with this condition has both ovarian tissue (containing follicles) and testicular tissue (containing seminiferous tubules), sometimes in separate gonads, sometimes combined in a single organ called an ovotestis.2Hormone Research in Paediatrics. Ovotesticular Difference of Sex Development: Genetic Background, Histological Features, and Clinical Management – Section: Histological Features and Pitfalls of Ovotesticular DSD This is confirmed by tissue biopsy, not by what the external genitalia look like.3Endocrine Practice. Clinical Profile and Outcome of Ovotesticular Disorder of Sex Development: Experience From a Tertiary Care Center in Western India
But having both types of gonadal tissue does not mean a person has two complete sets of genitalia. Externally, individuals with ovotesticular DSD usually have ambiguous genitalia, meaning the structures don’t clearly match what is typically seen in either males or females. A person might have a phallus that is larger than a typical clitoris but smaller than a typical penis, a partially fused labioscrotal fold, or a urogenital opening that differs from the expected position. The internal picture varies just as much: some have a uterus, some do not, and the arrangement of the fallopian tubes and vas deferens depends on which gonadal tissue is present on each side.
The genetic basis varies too. Some people with ovotesticular DSD are chimeras, carrying two distinct cell lines (46,XX and 46,XY) that merged from what were originally two embryos.4OBM Genetics. 46,XX/46,XY Chimerism & Human Sexual Development Others have a single karyotype, most commonly 46,XX, with the testicular tissue developing through mechanisms that are still not fully understood. The condition is rare by any estimate, and no two presentations are exactly alike.
Other Conditions That Affect Genital Appearance
Most people searching about “hermaphrodites” are reacting to the idea of genital ambiguity, and ovotesticular DSD is not the only condition that can produce it. Several other DSDs lead to external anatomy that doesn’t match the chromosomal or gonadal sex, even though the person has only one type of gonad.
Congenital Adrenal Hyperplasia
Congenital adrenal hyperplasia (CAH) is the most common cause of ambiguous genitalia in newborns with XX chromosomes. It results from enzyme deficiencies in the pathway that produces cortisol, which leads to an overproduction of androgens during fetal development.5PubMed Central. Classic congenital adrenal hyperplasia: A delayed presentation In girls, this excess androgen can enlarge the clitoris, partially fuse the labia, and otherwise virilize the external genitalia to varying degrees.6PubMed. The effect of fetal androgen metabolism-related gene variants on external genitalia virilization in congenital adrenal hyperplasia Internally, though, the ovaries and uterus are typically present and normally formed. In rare severe cases, the virilization can be complete enough that a child is initially assigned male at birth, with the underlying condition discovered only later.7PubMed. Complete virilization in congenital adrenal hyperplasia: clinical course, medical management and disease-related complications
Androgen Insensitivity Syndrome
Androgen insensitivity syndrome (AIS) works in roughly the opposite direction. A person with complete AIS has XY chromosomes and internal testes, but their body cannot respond to androgens. The result is external genitalia that appear typically female, a vagina (though often a shorter, blind-ended one), no uterus, and no menstruation.8PubMed Central. Complete Androgen Insensitivity Syndrome in Three Generations of Indian Pedigree Many individuals with complete AIS are not diagnosed until puberty, when menstruation fails to begin, or earlier if inguinal masses (undescended testes) are found during a routine exam.9Annals of Pediatric Endocrinology & Metabolism. Two Korean girls with complete androgen insensitivity syndrome diagnosed in infancy Partial forms of AIS exist too, producing a wider range of genital presentations.
5-Alpha Reductase Deficiency
This condition affects people with XY chromosomes who lack enough of the enzyme that converts testosterone into its more potent form, dihydrotestosterone (DHT). Because DHT drives much of the masculinization of external genitalia in the fetus, affected individuals are often born with genitalia that look female or ambiguous.10PubMed. 5-α-Reductase type 2 deficiency: is there a genotype-phenotype correlation? A review At puberty, the surge of testosterone causes significant virilization: the voice deepens, muscle mass increases, and the phallus grows. In some communities where this condition occurs at higher rates, affected individuals are raised female and then transition socially at puberty, a pattern that has drawn interest from researchers studying gender identity.11PubMed. Practical approach to steroid 5alpha-reductase type 2 deficiency
None of these conditions produce “both sets of genitalia.” Each one produces a body whose anatomy sits somewhere on a continuum, influenced by hormones, receptors, and timing during fetal development. The clinical scoring systems used to describe genital appearance reflect this: they measure features like phallic size, the degree of labioscrotal fusion, and the presence or absence of structures like the uterus, and the scores overlap considerably between children raised male and those raised female.12PubMed. The role of a clinical score in the assessment of ambiguous genitalia
How Common Are Intersex Conditions?
You’ve probably seen the figure that about 1.7% of people are born intersex. That number, originally proposed by biologist Anne Fausto-Sterling, has been widely cited, but it depends heavily on what you count. The 1.7% figure includes conditions like Klinefelter syndrome and late-onset adrenal hyperplasia, where the genital anatomy is typically unremarkable and most affected people go through life without ever knowing they have an atypical sex chromosome arrangement or adrenal variant. When the definition is narrowed to conditions where the genitalia are visibly atypical or where chromosomal sex doesn’t match the phenotype, the estimate drops to roughly 0.018%, which is about 1 in 5,500 births.13PubMed. How common is intersex? a response to Anne Fausto-Sterling The gap between these numbers matters because it shapes how people think about the issue. Neither figure is “wrong,” but they measure very different things. Ovotesticular DSD specifically is among the rarest of all these conditions.
Can People With Ovotesticular DSD Have Children?
Fertility is uncommon but not impossible. Across most forms of DSD that involve atypical gonadal development, the ability to conceive or father children is significantly reduced.14Journal of Pediatric Urology. Fertility issues in disorders of sex development In ovotesticular DSD, the testicular tissue rarely produces viable sperm, and while the ovarian tissue can sometimes produce follicles and even ovulate, the presence of mixed gonadal tissue and the effects of prior surgeries often compromise fertility further.
That said, isolated pregnancies have been reported. In one documented case, a woman with ovotesticular DSD who had undergone surgery to remove one gonad in childhood retained a functioning ovary in her remaining gonad. She was confirmed to ovulate spontaneously, and after unsuccessful attempts at artificial insemination (complicated by vaginal narrowing from earlier reconstructive surgery), she conceived through IVF and delivered a healthy infant.15Journal of Nippon Medical School. Successful in Vitro Fertilization Pregnancy and Delivery by an Infertile Woman with Ovotesticular Disorder of Sex Development: A Case Report Reports like this are counted in single digits worldwide. No case of a person with ovotesticular DSD fathering a child through their own sperm has been documented.
The Debate Over Early Surgery
For decades, the standard medical approach to infants born with ambiguous genitalia was early surgical intervention to make the anatomy conform more closely to either a male or female norm. That practice has come under intense scrutiny. Many adults who underwent these surgeries as infants report loss of sensation, psychological distress, and anger at not having been able to consent to irreversible procedures performed on their bodies. Bioethicists and patients’ advocates have called for delaying any feminizing or masculinizing surgery until the individual is old enough to participate in the decision, with exceptions only for genuine medical emergencies like urinary obstruction.16PubMed Central. A principled ethical approach to intersex paediatric surgeries17PubMed Central. Ethical principles and recommendations for the medical management of differences of sex development (DSD)/intersex in children and adolescents
This remains one of the most contentious areas in pediatric medicine. Parents understandably want clear guidance and may feel pressure to “normalize” their child’s body. Surgeons point out that some procedures are technically easier in infancy and that families face real social stigma. On the other side, intersex adults and advocacy organizations argue that cosmetic genital surgery on infants who cannot consent is a human rights issue, not a medical one. Several countries and medical bodies have begun restricting these surgeries, though practice varies widely across the world.
Where “Both Genitalia” Is the Norm
If the question is broadened beyond humans, the answer changes dramatically. Hermaphroditism is extremely common in the rest of the biological world. Many animal species are simultaneous hermaphrodites, meaning each individual produces both eggs and sperm at the same time. Earthworms, most land snails, and many sea slugs fall into this category.18PubMed. Coevolution of male and female reproductive traits in a simultaneously hermaphroditic land snail When two snails mate, both individuals can give and receive sperm, and both can go on to lay fertilized eggs. For these organisms, the term “hermaphrodite” describes normal reproductive biology, not an anomaly.
Other species practice sequential hermaphroditism, changing sex during their lifetime. Clownfish are protandrous: they start life as males, and the dominant fish in a group becomes female. The aromatase gene plays a central role in this transformation, triggering the restructuring of gonadal tissue from testis to ovary.19PubMed Central. Sex Change in Clownfish: Molecular Insights from Transcriptome Analysis Cleaner wrasses go the other way: they are protogynous, starting as females and switching to male when the dominant male of the group disappears. The largest female takes over the territory and changes sex.20Animal Behaviour. Effect of changing harem on timing of sex change in female cleaner fish Labroides dimidiatus These transitions involve complete functional changes to the gonads: a female cleaner wrasse that becomes male will produce sperm, not eggs.
Plants take hermaphroditism further still. The majority of flowering plant species produce flowers that contain both male parts (stamens producing pollen) and female parts (pistils receiving pollen). Some species even have multiple strategies within a single population: the subalpine lily Lilium lankongense, for instance, includes individuals that are purely male, purely hermaphrodite, or a mix of both flower types on the same plant.21PubMed Central. Both small and large plants are likely to produce staminate (male) flowers in a hermaphrodite lily
Why Separate Sexes Evolved at All
Given how common hermaphroditism is across life, a reasonable follow-up question is why humans and most other mammals have separate sexes in the first place. The evolutionary pressures that favor one strategy over the other have to do with population density and the efficiency of finding a mate. In species where individuals are scattered and encounters with potential mates are rare, hermaphroditism offers an obvious advantage: any individual you meet is a potential partner, and if you can’t find anyone at all, self-fertilization may be a fallback. Modeling work has shown that at very low population densities, self-fertilizing hermaphrodites have a strong selective advantage, but that advantage shrinks in species that are efficient at locating mates.22PubMed. Mate-search efficiency can determine the evolution of separate sexes and the stability of hermaphroditism in animals
For large, mobile animals like mammals that can actively seek mates across wide territories, the cost of maintaining two full sets of reproductive organs outweighs the benefit. Specialization allows each sex to invest more heavily in one reproductive strategy: producing large, nutrient-rich eggs or producing vast numbers of tiny sperm. This division is deeply embedded in mammalian development, governed by cascading genetic signals that begin early in embryonic life. The DSD conditions described earlier represent cases where that cascade takes an unusual path, but the underlying developmental program in mammals strongly pushes toward one outcome or the other.
Gynandromorphs and the Limits of Binary Labels
Even in species with separate sexes, unusual individuals occasionally appear with a patchwork of male and female traits. Insects and birds can produce gynandromorphs, organisms that are literally half-male and half-female, split down the middle, with male plumage or coloring on one side and female on the other. This happens through errors during early cell division and is mechanistically distinct from the hormonal pathways that drive mammalian sex development. A gynandromorph cardinal, for example, might have a red male side and a brown female side because the cells on each half carry different sex chromosomes.23PubMed Central. Descriptive versus causal morphology: gynandromorphism and intersexuality
These cases highlight something researchers have been emphasizing for decades: the categories “male” and “female” describe broad developmental endpoints, not locked binary switches. In mammals, a consistent suite of genes, hormones, and receptors usually drives development toward one endpoint. When any piece of that suite varies, the outcome varies. That is not pathology in the moral sense. It is biology doing what biology does, which is produce variation. The terminology has shifted to reflect that understanding, but the underlying phenomena have been recognized in medicine and natural history for centuries.