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The potential for volunteer bias in studies of human penis length, where men with larger penises may be more likely to participate.
Studies that use clinician measurements and systematic reviews place the average erect adult penis in the general population at roughly 13–13.5 cm (about 5.1–5.3 inches), and race‑by‑race differences—...
Clinical (researcher- or clinician-measured) studies and meta-analyses consistently find the mean erect human penis length in the range of ~12.9–13.6 cm (about 5.1–5.4 in), with flaccid and stretched ...
A fully erect circumference of (≈15.8 cm) is substantially larger than the measured averages in major reviews and would be classified as above‑average or “large” by the datasets commonly cited in medi...
A penis measuring 6.75 inches when erect is larger than the typical recorded averages but not extraordinarily rare; most large meta-analyses put the average erect length between about 5.1 and 5.5 inch...
Multiple large reviews and clinical studies find a consistent gap: self-reported erect penis lengths average roughly 6.0–6.6 inches in many surveys, while clinician-measured studies converge on about ...