Pubic hair texture varies from person to person, and having straight pubic hair instead of the stereotypical tight curl is more common than most people assume. The texture of any hair on your body, pubic included, is set primarily by the shape of the follicle it grows from and the way cells divide inside that follicle. If your follicles are relatively symmetrical and straight in their orientation beneath the skin, the hair that emerges will be straight or only slightly wavy. The idea that pubic hair is always curly is a widespread assumption, but it does not hold up once you look at the range of normal variation.
How Follicle Shape Decides Whether Hair Curls
Every hair on your body grows from a tiny pocket in the skin called a follicle. The shape of that follicle, and specifically the shape of the bulb at its base, is the main factor determining whether a hair comes out straight, wavy, or tightly coiled. Research comparing scalp biopsies from people with very curly hair to those with straight hair found a dramatic structural difference: in curly-haired individuals, the follicle was curved beneath the skin with the bulb bent into a hook shape, while in straight-haired individuals, the follicle sat relatively upright and the bulb was not bent.1PubMed. Human hair shape is programmed from the bulb That bend forces the growing hair fiber to curve as it pushes upward through the skin.
Inside the bulb, cells that build the hair shaft divide at different rates on opposite sides of the follicle. In curly hair, the dividing cells are lopsided: more of them cluster on the outer curve, and the inner layers of the hair shaft form at different speeds on each side. This asymmetry produces an oval or ribbon-shaped cross-section rather than a circular one. A keratin protein called hHa8 distributes unevenly in curly fibers, piling up on the concave side. In straight hair, by contrast, this keratin spreads evenly around a rounder cross-section.2PubMed. Human hair keratin network and curvature So the curl is baked in at the cellular level before the hair even reaches the skin’s surface.
This same principle applies to pubic hair. If your pubic follicles happen to be straighter and more symmetrical, the hair they produce will be straighter. There is nothing unusual or “wrong” about this outcome. It simply means the architecture of your follicles in that region happens to produce a fiber with a rounder cross-section and more even internal structure.
Why Pubic Hair and Scalp Hair Often Look Different
You might have curly hair on your head and straight hair below, or vice versa. This disconnect confuses people, but it makes sense once you understand that follicle shape is not uniform across the body. Your scalp follicles, armpit follicles, and pubic follicles all developed somewhat independently and are influenced by different local hormonal environments. The skin in the pubic region responds heavily to androgens, the group of hormones that includes testosterone. When puberty hits and androgen levels rise, the fine vellus hairs in the pubic area are replaced by thicker terminal hairs. The type of terminal hair that appears depends on the follicle shape already present in that skin.
People often assume pubic hair is always curly because coarser, more tightly coiled pubic hair is common in many populations and tends to be what gets discussed as the default. But “common” is not the same as “universal.” Individuals of East Asian descent, for example, frequently have straight or minimally wavy pubic hair, consistent with their scalp hair texture. Other people of any background can have pubic hair that ranges from poker-straight to loosely wavy to tightly curled, without any of those outcomes signaling a problem.
The coarseness of pubic hair also plays tricks on perception. Even slightly wavy pubic hair can look curlier than it really is because it is thicker and stiffer than scalp hair, causing it to bend and kink against clothing and skin. If your pubic hair lies flat and straight, it probably means your follicles in that area are symmetrical enough that even the extra thickness does not introduce much curve.
The Genetic Side
Hair texture is one of the most heritable physical traits. Genetics influence the shape of every follicle on your body, including those in the pubic region. One of the clearest genetic links to straight hair involves a variant in a gene called EDAR. A study of over 1,700 individuals from four East Asian populations found that a specific version of this gene, known as the 370A variant, was strongly associated with straight hair, with each copy of the variant roughly doubling the odds of having straight hair.3PubMed. The adaptive variant EDARV370A is associated with straight hair in East Asians The effect was additive, meaning people with two copies had straighter hair than those with one.
EDAR is far from the only gene involved. Hair texture is a polygenic trait, meaning dozens or possibly hundreds of genes each nudge the follicle toward being slightly more curved or slightly more straight. Keratin genes play a direct role in the structural proteins that make up the hair shaft. Research in other mammals has confirmed that mutations in keratin genes can dramatically change coat texture: a variant in the KRT71 gene, for instance, was found to be responsible for the distinctively curly coat of a specific cat breed.4PubMed Central. A splice variant in KRT71 is associated with curly coat phenotype of Selkirk Rex cats While cat coat genetics do not map directly onto human pubic hair, the finding underscores how sensitive hair curvature is to changes in the proteins that form the fiber.
The practical upshot is that your pubic hair texture is mostly inherited. If your parents or close relatives tend to have straight body hair, you are more likely to as well. There is no single “pubic hair gene” that works independently of the rest of your body’s hair genetics. The same genetic toolkit that shapes your scalp hair follicles also shapes your pubic ones, though hormonal and regional factors can modify the final result.
Hormones, Aging, and Texture Changes Over Time
Pubic hair is not static. Its texture, thickness, and even its presence can shift throughout your life, driven largely by hormones. The initial arrival of pubic hair during puberty is triggered by rising androgen levels. These hormones stimulate the follicle to produce the coarser terminal hair associated with adult pubic hair. How curly or straight that hair turns out depends on follicle shape, but the hormones themselves can influence hair diameter and stiffness, which affects how curly the hair appears.
Pregnancy is another period of hormonal upheaval that can temporarily change hair texture across the body. Some people notice their pubic hair becomes coarser or curlier during pregnancy, while others find it thins out. These changes usually reverse after delivery, though not always completely.
As you age, hormone levels shift again. After menopause, declining androgens affect body hair at androgen-sensitive sites. A cross-sectional study found that body hair loss correlated with older age, particularly in areas most responsive to androgens.5PubMed. Physiological changes in scalp, facial and body hair after the menopause: a cross-sectional population-based study of subjective changes The pubic region is one of those sites. Some older adults find their pubic hair becomes finer, sparser, or changes in texture as a result. Hair that was once curly may become wavier or straighter as the follicle structure gradually changes with reduced hormonal stimulation. If you have noticed your pubic hair becoming straighter over time rather than always being that way, shifting hormones are a likely explanation.
The Anatomy of Curvature at the Fiber Level
If you zoom in even further than the follicle, the fiber itself has structural features that maintain or resist curvature. Research on wool fibers, which share many structural similarities with human hair, has shown that curvature is related to the types of cells that make up the fiber’s cortex. In curved fibers, cells on the outside of the bend are longer than cells on the inside, creating a built-in imbalance that keeps the fiber curling.6PubMed. Intrinsic curvature in wool fibres is determined by the relative length of orthocortical and paracortical cells In straight fibers, the cortical cells are more uniform in length and distribution, so there is no structural bias toward bending in any particular direction.
This means that even after hair leaves the follicle, its internal architecture holds it in shape. A straight pubic hair is not just a curly hair that has been flattened out by some external force. It is structurally different on the inside: its protein bundles are more evenly balanced, its cross-section is rounder, and the cells that make up its core are more uniform. The straightness is intrinsic to the fiber, not something imposed on it after the fact.
Can Medical Conditions Change Pubic Hair Texture?
If your pubic hair has always been straight, genetics almost certainly explains it. But if your previously curly hair has recently become noticeably straighter or changed texture, it is worth paying attention. Certain autoimmune conditions can alter hair curl patterns. Case reports have documented that conditions affecting the hair follicle can disrupt the proteins and enzymes responsible for maintaining curl. Researchers have suggested that changes in a specific enzyme involved in protein cross-linking within the hair shaft, along with rearrangement of structural keratins, can reduce curvature in people who previously had tightly curled hair.7PubMed Central. “Downy hair sign”—A clue to autoimmune disease in curly hair These acquired changes in curl pattern have been flagged as a potential early sign of autoimmune disease in people with naturally curly or coiled hair.
Thyroid disorders can also affect hair texture body-wide. An underactive thyroid tends to make hair drier, coarser, and sometimes straighter, while an overactive thyroid can produce finer, softer hair. Nutritional deficiencies, particularly in iron, zinc, and biotin, can affect hair quality and growth patterns across the body, including the pubic region. Medications such as certain chemotherapy agents, anticonvulsants, and hormonal treatments can alter hair texture as a side effect.
The key distinction is between “my pubic hair has always been this way” and “my pubic hair recently changed.” The first scenario is almost always just your genetics at work. The second scenario, especially if it is accompanied by other symptoms like hair thinning, skin changes, or fatigue, is worth mentioning to a doctor.
Why Pubic Hair Exists in the First Place
Understanding what pubic hair does can help put its texture into context. Pubic hair serves several biological functions regardless of whether it is curly or straight. It reduces friction against the skin during movement and sexual activity, protecting the sensitive genital area from irritation and small abrasions. It also acts as a barrier against pathogens, and it plays a role in trapping and dispersing pheromones, which are scent molecules involved in sexual signaling.8The Journal of Reproductive Medicine. Pubic Hair and Sexual Intercourse: Protective, Evolutionary, and Sociocultural Dimensions
Curly pubic hair is sometimes assumed to be “better” at these jobs because the coils create more volume and surface area to trap pheromones or cushion against friction. There is some logic to this, but straight pubic hair still lies over the same skin and still provides a physical buffer. The difference in functional performance between straight and curly pubic hair has not been studied in any rigorous way. From an evolutionary standpoint, the presence of pubic hair at all is the significant trait; the degree of curl is secondary variation shaped by the same genetic pressures that determine hair texture across the rest of the body.
Common Misconceptions About Pubic Hair Texture
A few myths circulate widely enough to be worth addressing directly. One is that shaving or trimming changes the texture of pubic hair when it grows back. It does not. Shaving cuts the hair at a blunt angle, which can make regrowth feel stiffer and coarser as the blunt tip pushes through the skin, but the actual structure of the hair fiber is unchanged. A straight hair that is shaved will grow back straight. A curly hair will grow back curly. The follicle sets the program, and a razor does not reach the follicle.
Another misconception is that pubic hair texture indicates something about overall health or sexual development. Straight pubic hair is not a sign of a hormonal imbalance, delayed development, or anything else medically significant if it has always been that way. Pubic hair texture varies as much between individuals as scalp hair texture does, and none of the variants are inherently more or less healthy than any other.
A third myth worth dispelling is that everyone’s pubic hair matches their scalp hair. While the genetics overlap, the local hormonal environment can produce different outcomes in different body regions. Having curly hair on your head and straight hair on your body, or vice versa, is common and normal. The mismatch does not indicate anything except that your follicle shapes differ between regions, which they often do.
Ethnicity, Population Variation, and the Range of Normal
Population-level patterns in hair texture are real and well-documented, though they describe averages rather than rules. People of sub-Saharan African descent tend to have the most tightly coiled hair overall, including pubic hair, due to follicles that are strongly curved beneath the skin with asymmetrical cell division in the hair bulb.1PubMed. Human hair shape is programmed from the bulb People of East Asian descent tend to have the straightest hair overall, with rounder follicle cross-sections, and the EDAR variant described earlier is one contributor to this pattern.3PubMed. The adaptive variant EDARV370A is associated with straight hair in East Asians People of European descent fall somewhere in between, with a wide distribution from straight to very curly.
These are population-level tendencies, not individual guarantees. Plenty of people within any ethnic group have hair textures that do not match the group average. Mixed ancestry further broadens the range of possible outcomes, since you may inherit follicle-shaping genes from ancestors with very different hair textures. If your pubic hair is straight and this seems inconsistent with your ethnic background, it is most likely that the genetic dice simply landed that way for you. Hair texture genes segregate independently, so it is entirely possible to inherit a combination that produces straight pubic hair even if most of your relatives have curly hair.
Researchers still do not have a complete map of every gene that influences hair curvature. The EDAR variant accounts for a measurable portion of the straight-versus-curly spectrum in East Asian populations, but it explains only part of the picture even there. In European and African populations, the relevant genes are less well-characterized. This is an area where the genetics are genuinely complex and incompletely understood, so anyone claiming they can predict your exact hair texture from a DNA test is overstating what the science currently allows.
Grooming and Texture Perception
How you manage your pubic hair can affect how its texture looks and feels, even though it does not change the underlying structure. Longer pubic hair has more opportunity to show its natural curl pattern, if it has one. Hair that is kept very short may appear straight simply because it has not grown long enough to reveal any wave. Conversely, straight pubic hair that is grown out will remain straight and may lie flat against the skin rather than forming the bushy appearance associated with curly pubic hair.
Moisture and products also affect perception. Pubic hair, like scalp hair, can appear curlier when wet and then relax somewhat as it dries, depending on its natural texture. Conditioners or oils applied to the pubic area can weigh hair down and reduce apparent curl. None of these factors change the follicle or the fiber’s internal structure; they just alter the way the hair drapes and moves on the surface. If your pubic hair looks straight after a shower and while dry, you can be confident that straight is its natural state, not an artifact of how you are caring for it.