Dr Arthur L Burnett II, professor of urology at Johns Hopkins University School of Medicine, has outlined medical facts surrounding average penis size and enlargement risks.
Over a four-decade career as a urologist, Burnett has examined thousands of men. He noted that while patients rarely ask about size outright, many bring up the subject at the end of consultations for erectile dysfunction or skin rashes.
Burnett explained that flaccid length does not predict erect length, referencing the common locker-room distinction between showers and growers. He added that he does not routinely use a measuring tape during consultations because he can identify typical medical ranges at a glance.
According to Burnett, older studies on penile dimensions were often unreliable because they depended on self-reported measurements. Most urologists consider a 2015 systematic review led by King's College London to be the gold standard in size research.
The King's College London review combined data from 17 separate studies involving more than 15,500 men. All measurements were conducted by trained healthcare professionals using standardized medical methods rather than self-reporting.
Gold Standard Research on Average Dimensions
Researchers focused on stretched flaccid length, which involves gently stretching the penis to its maximum comfortable length. Medical professionals use this metric because it remains stable regardless of temperature or anxiety, closely predicting erect length.
The review established that the average flaccid penis measures 9.16 centimeters or 3.6 inches. The average stretched flaccid penis measures 13.24 centimeters or 5.2 inches, matching direct erect measurements from other studies that averaged 13.12 centimeters or 5.16 inches.
Burnett observed that many men who express concern about their size fall well within typical anatomical ranges. He noted treating patients with penises measuring six to eight inches who remained convinced they were inadequate.
Some of these individuals suffer from penile dysmorphic disorder, a condition where a person with a healthy penis believes it is too short. Burnett suggested that pornography reinforces unrealistic expectations and propagates the myth that larger size increases female sexual satisfaction.
Medical Causes of Size Variations
Medical definitions classify a micropenis as an adult stretched length of roughly 9.3 centimeters or 3.7 inches or less. Burnett explained that the condition typically stems from hormonal or genetic disruptions prior to birth, or broader disorders of sexual development.
Burnett noted an increasing incidence of congenital genital abnormalities in his practice. He stated that researchers suspect fetal exposure to environmental chemicals such as plasticizers may disrupt normal development during pregnancy.
Hormone treatments administered during infancy or childhood can sometimes encourage growth in micropenis cases. However, Burnett emphasized that treatment options become significantly more limited once a patient reaches adulthood.
Another condition, buried penis, occurs when pubic skin or fat conceals part or all of the penile shaft. Obesity represents the primary cause, though previous surgeries such as circumcisions that remove excess skin can also trigger the condition.
Weight loss and modern weight-loss medications can improve the visibility of a buried penis. For residual fat or surgical scarring, reconstructive operations, liposuction, or skin grafts performed alongside plastic surgeons may restore visible length.
Risks of Cosmetic Enlargement Procedures
Penoscrotal webbing occurs when scrotal skin extends up the underside of the shaft, making the penis appear shorter. Corrective surgery can remove the webbed skin and expose existing length without modifying internal structures.
Burnett cautioned against cosmetic enlargement operations for men who simply desire larger dimensions. Dermal filler injections using hyaluronic acid carry risks of migration, lumpiness, and long-term disfigurement.
Suspensory ligament release surgery cuts the ligament anchoring the penis to the pubic bone to expose internal shaft length. Burnett warned that cutting the ligament alters erection angles, while post-operative scar tissue can leave the penis shorter than before.
Burnett has also treated patients suffering from injuries caused by mechanical penile traction devices. Prolonged stretching from these devices caused permanent numbness, nerve damage, and severe skin trauma in several cases.
The most severe complications seen in Burnett's practice involve permanent disfigurement, tissue loss, and uncorrectable scarring. He stated that current medical technology offers no procedure capable of safely and genuinely lengthening the penis, though future gene therapies or tissue regeneration may emerge.
Sexual Satisfaction and Extreme Anatomical Cases
Burnett highlighted that anxiety over size primarily affects younger single men attempting to form relationships. When psychological distress exceeds normal anxiety levels, he refers patients to specialized mental health colleagues.
In his clinical observations, Burnett noted that several patients requiring penile implants for severe erectile dysfunction possessed relatively long penises. He speculated that larger volumes of erectile tissue might make achieving full rigidity more difficult in some individuals.
Medical evidence does not support claims that larger size leads to better sexual satisfaction. Burnett pointed out that female sexual pleasure relies primarily on the clitoris, surrounding external genitalia, and the outer vaginal region.
Extreme anatomical variations exist globally. Michael Phillips claims to have the smallest erect penis in the world at 0.38 inches, stating that penetrative sex is impossible and that he must sit down to urinate.
Conversely, Jonah Falcon claims the world's largest penis at 13.5 inches. However, Falcon has acknowledged experiencing difficulties achieving a complete erection.
Burnett concluded that personal worth and sexual performance are not determined by physical dimensions. He stated that relationship quality depends on how a partner behaves, communicates, and treats their companion.
