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Originally Posted by TheBeast  Environmental hormones (or depending on what school you went to chemicals mimicking hormones etc etc) in some places might play an issue. |
Good one. Maybe female hormones in the water supply. There are some fertility drugs that can make women have boys with low testosterone which I assume also means smaller penises.
Mainly though I would say diet and lifestyle probably only serve to 'maintain' the health/size of your penis rather than increase its size.