Is the size of a penis when erect proportional to its size when flaccid? I've heard this most commonly in that you're either a shower or a grower. For example this site talks about the claim accepting it as true. Is there any proof that a smaller flaccid penis (<10cm) can result in a larger penis when erect, than a penis which is large when flaccid (>12.5cm)?

**Penile length in the flaccid and erect states** (1996):

> **METHOD** :
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> We prospectively **measured flaccid and erect penile dimensions in 80 physically normal men before and after pharmacological erection**.
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> **RESULTS** :
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> Mean flaccid length was 8.8 cm., stretched length 12.4 cm. and erect length 12.9 cm.
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> **Neither patient age nor size of the flaccid penis accurately predicted erectile length**. Stretched length most closely correlated with erect length.


**More:**

* Summaries of several studies regarding "Penile Size"