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Old 08-22-2004, 10:28 PM
Askance Askance is offline
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Join Date: May 2003
Location: Sydney, Australia
Posts: 7,037
KP is right. It's not that extra blood gets pumped into a penis to make it erect, it's that blood flow is restricted to make it flaccid. Erections occur during sleep to make sure it gets enough blood to be healthy.