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The comparison of penis size across different ethnicities and the limitations of such studies due to factors like volunteer bias and methodological heterogeneity.
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—...
Large, peer-reviewed syntheses place the average erect human penis in the 5.1–5.5 inch (≈13–14 cm) range and show that many popular predictors—shoe size, hand size, or height—do not reliably forecast ...