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Genital development

Genital development influenced by genetics, hormones, and developmental factors

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Jan 16, 2026
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What are the average flaccid and stretched penile lengths for Tanner stage I through V?

Clinical staging of male puberty (Tanner I–V) correlates with predictable increases in penile size, but precise average values for flaccid and stretched penile length (SPL) by Tanner stage are heterog...