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Investigator-measured studies

Investigator-measured studies report flaccid, stretched, and erect penile lengths

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Jan 21, 2026

What's the estimated erect girth for a flaccid girth of 4.5 to 4.75 inches

A straightforward way to estimate erect girth from a given flaccid girth is to use observed population averages: measured studies report mean flaccid circumference about 3.67 inches and mean erect cir...

Jan 14, 2026

Why do researchers prefer stretched flaccid length over erect measurements?

Researchers often use stretched flaccid penile length because it offers a practical, reproducible proxy for erect length that can be measured in clinic without pharmacological induction of erection, e...