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wikify erection
In non-erect state, the so-called Blood Penis (or "[[Grower]]") is often very small (more than half as large as in the erect state). During [[erection ]] the erectile tissue in the penis grows substantially, to give the [[penis]] its necessary size, length, and stiffness for penetration.
The popular opinion doesn't seem to be confirmed scientifically so far, that men with ancestors from cold regions of the world tend to the blood penis, because there the protection from the cold by the shrinking of the non erect [[penis]] is necessary.