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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)?

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

METHOD:

We prospectively measured flaccid and erect penile dimensions in 80 physically normal men before and after pharmacological erection.

RESULTS:

Mean flaccid length was 8.8 cm., stretched length 12.4 cm. and erect length 12.9 cm.

Neither patient age nor size of the flaccid penis accurately predicted erectile length. Stretched length most closely correlated with erect length.


More:

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    A direct link to Medscape doesn't seem to work (asks for a Login ), that's why I'm using a Google redirect link. – Oliver_C Feb 5 '12 at 11:31
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The Kinsey Institute's Penis Size FAQ explains:

There is a much wider range of size in men's penises when flaccid, with the average ranging from 2.5cm to 10cm (1 to 4 inches). In general, smaller flaccid penises lengthen at erection by a greater percentage than do larger flaccid penises, with most men reaching an average size of 12.5cm to 17.5cm (5 to 7 inches), so the flaccid size of a penis is not a good predictor of erect size.

They do not link to a particular study, but provide general references, including to

  • Jamison, P.L., and Gebhard, P.G. (1988). Penis size increase between flaccid and erect states: An analysis of the Kinsey data. Journal of Sex Research, 24, 177-183.

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