Buy backpacks, exercise machines, athletic shoes, and more at Fogdog Sports. At some time in his life, almost every man finds himself with an aroused mind, a willing partner, and a penis that refuses to cooperate. About 10 million American men are impotent, which means they consistently have trouble achieving an erection or keeping one long enough to have sex.
Erections start in the mind.
The arteries become relaxed, the blood flow to his penis increases to seven times the normal volume, and an erection is born. Extra blood keeps rushing in as long as the man stays aroused or until he ejaculates. Of course, the whole process can break down. If the brain doesn't send the right signals, or if the arteries can't respond to them, a man will be unable to have an erection. Many things can thwart an erection at one or more of the steps along the way.