The “taint” is a slang term for the perineum, the patch of skin and underlying tissue between the anus and the genitals. In men, it sits between the anus and the base of the penis. In women, it lies between the anus and the vaginal opening. Despite the casual name, this small area plays a surprisingly important role in pelvic support, sexual function, and everyday bodily control.
Where the Name Comes From
The slang term “taint” is a play on the idea that this area “t’ain’t” one thing or the other, sitting in a no-man’s-land between the genitals and the anus. The formal medical term, perineum, traces back to ancient Greek. The original Greek word roughly meant “the empty region,” which, as the Online Etymology Dictionary notes, lands surprisingly close to the same joke the modern slang makes.
Anatomy of the Perineum
The perineum is diamond-shaped when viewed from below. Its borders run from the pubic bone at the front to the tailbone at the back, with the sit bones (the bony points you feel when sitting on a hard chair) marking the sides. An imaginary line drawn between those sit bones divides the perineum into two triangles: a front triangle containing the urinary and genital structures, and a back triangle containing the anal canal and its sphincters.
At the center of all this is the perineal body, a dense knot of fibrous tissue and muscle that acts as an anchor point. In men, it has a pyramid shape; in women, more of a wedge. Multiple muscles converge here, making it the structural keystone of the pelvic floor. The average length of the perineal body in women is about 3.9 centimeters, though this varies. A shorter perineal body (2.5 cm or less) is associated with a higher risk of significant tearing during childbirth.
What It Does
The perineum is far more than just skin. Beneath the surface, several muscles work together in a sling-like arrangement around the openings of the urethra, vagina (in women), and anus. These muscles help you control urination and bowel movements by supporting the external sphincters for both the urethra and the anus. They also contribute to sexual function, since muscles involved in erection and orgasm (like the bulbospongiosus and ischiocavernosus) are anchored in this region.
The perineal body itself serves as the central attachment point for these muscles. If it weakens or tears, the entire system of pelvic support can be compromised, potentially leading to problems like urinary incontinence or pelvic organ prolapse.
How It’s Wired
Sensation in the perineum comes primarily from the pudendal nerve, which originates from the lower spinal cord (at the S2 through S4 levels). This nerve takes a winding path out of the pelvis, loops around a ligament near the base of the spine, then re-enters the pelvic region through a connective tissue tunnel along the inner wall of the pelvis. Along the way, it branches into three main divisions: one serving the anal area, one serving the perineum itself, and one reaching the clitoris or penis.
The pudendal nerve carries both sensory signals (touch, pressure, pain) and motor signals that let you voluntarily tighten the urethral and anal sphincters. This is why perineal nerve damage, whether from prolonged cycling, childbirth, or surgery, can affect both sensation and continence.
Why It Matters During Childbirth
The perineum stretches significantly during vaginal delivery, and tearing is common. Clinicians classify perineal tears into four degrees. A first-degree tear is superficial, affecting only the skin. A second-degree tear goes deeper into the perineal muscles. Third-degree tears extend into the anal sphincter, and a fourth-degree tear goes all the way through the sphincter and into the rectal lining.
Episiotomy, a surgical cut to the perineum during delivery, was once routine but is now recommended only in specific situations. The World Health Organization advises that episiotomy rates should stay below 10% of vaginal deliveries. Research shows that routine use doesn’t reliably prevent severe tears and may actually increase the risk of third- or fourth-degree lacerations in some circumstances, particularly during complicated deliveries involving instruments or unusual fetal positioning.
Common Causes of Perineal Pain
Pain in the taint area is not unusual and can stem from several causes. In men, one of the most common is chronic prostatitis or chronic pelvic pain syndrome, which produces a deep ache concentrated in the area between the anus and genitals, often accompanied by difficulty urinating. Acute bacterial prostatitis is more dramatic, with intense perineal pain, fever, and chills. In both men and women, perineal pain can also result from muscle tension in the pelvic floor, nerve irritation (particularly of the pudendal nerve), skin conditions, or infections.
Prolonged pressure on the perineum from activities like cycling is another well-known trigger. The pudendal nerve runs through a relatively confined space, and sustained compression against a bike saddle can cause numbness, tingling, or pain that sometimes persists after the ride.
Keeping the Area Healthy
The skin of the perineum is thinner and more sensitive than skin elsewhere on the body, and it sits in an environment prone to moisture, friction, and contact with bacteria. Harvard Health Publishing recommends using a very mild, non-alkaline soap or a soap-free perineal cleanser. Harsh soaps and scrubbing can break down the skin’s protective barrier.
After washing, air-drying or gently patting the area dry is preferable to rubbing. If moisture is a recurring issue (from incontinence, sweating, or athletic activity), a barrier product like petroleum jelly or a film-forming skin protectant can shield the skin from irritation. Fungal infections can develop in this warm, enclosed area, and over-the-counter antifungal creams containing clotrimazole or miconazole are a standard first-line treatment.
Anogenital Distance as a Health Marker
Researchers have found that the distance from the anus to the genitals, measured precisely from specific anatomical landmarks, reflects hormone exposure during fetal development. This measurement, called anogenital distance, is naturally longer in males than in females because of the influence of androgens (male sex hormones) in the womb. The U.S. Environmental Protection Agency has designated it as an official marker for reproductive toxicity in animal studies, and researchers are working to establish whether it has similar clinical value in humans. In animal research, a shorter-than-expected anogenital distance in males is linked to genital abnormalities and reduced fertility, potentially reflecting disrupted hormone signaling from environmental chemical exposure during pregnancy.