You need to have erections regularly to keep your penis in shape. “It has to be essentially exercised,” says Tobias Kohler, MD, assistant professor of urology at

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An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firmer, engorged and enlarged.

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WebMD explains the parts of a penis, how you get an erection, and how ejaculation happens.

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Second only to wanting a larger penis, many men want to have a harder penis. Who doesn’t want to have a rock-hard erection, which not only feels great but really