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Viagra is a drug to stimulate the male reproductive organs to stay in an erect state. It is used to maintain an erection. The nerves around the blood vessels of the penis secrete nitric oxide. The nitric oxide in turn tells bloodvessels to make cGMP. The cGMP relaxes mussels and enlarges the vessels. This makes the penis erect.
However, there is an enzyme that destroys the cGMP. It is called PDE5. So the PDE5 breaks up the cGMP. The result is a flacid, non-erect penis. Who needs that?
That's why people use viagra. Viagra makes sure that PDE5 does not break off the cGMP. In this way you are able to maintain an erection. You will still have to get aroused yourself, viagra does not arouse. It maintains and prolongs an erection.
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