The key to getting a bigger penis is blood flow, the more blood that flows to the penis and the longer it gets retained there the bigger you will get. This is how erections work, there is massive in rush of blood which is prevented from flowing out by capillaries that have constricted. If you can force even more blood in there it will stretch the penis and force it to become larger. This is how products like grow max pro work, the increase blood flow while at the same time constricting the capillaries. Over time this will force the penis to become bigger.
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