The penis is a remarkable feat of engineering. One moment, it's soft and flat, and seconds later, it's standing out from the body and throbbing with sensation. When the stimulation has passed, it returns to its soft state once more as though nothing had happened. As many an embarrassed teen knows all too well, an erection comes on whether a man wants it or not, and much of the process is outside of a man's sphere of control. But knowing how the penis works could help men know their bodies ju...


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