비아그라에 대한 최고의 가이드

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Sexual stimulation that causes an erection causes the output and launch of nitric oxide from the penis. Nitric oxide will cause an enzyme, guanylate cyclase, to make cyclic guanosine monophosphate (cGMP) which is largely responsible for raising and decreasing the size of blood vessels carrying blood to and from the penis and producing an erection.O