factually
Index/Topics/Finger Length and Penis Size Correlation

Finger Length and Penis Size Correlation

The correlation between finger length ratio and penis size, influenced by prenatal androgen exposure.

Fact-Checks

2 results
Jan 24, 2026
Most Viewed

Do any medical studies support a correlation between hand size and penis size?

A handful of peer‑reviewed medical studies report a statistically significant correlation between the ratio of the second and fourth digits (2D:4D, the relative lengths of the index and ring fingers) ...

Feb 1, 2026

What prenatal markers predict adult penile size and how strong is that evidence?

Multiple prenatal markers have been proposed to —most prominently (AGD), the second‑to‑fourth digit ratio (2D:4D), direct prenatal penile measurements (ultrasound/MRI), prenatal androgen levels, and m...