However, certain physical or psychological factors can interfere with this natural process and, for whatever reason, men at any time of their lives can find it hard to gain and/or maintain a firm erection. That's nearly 30 million men in America alone. Let's take a look at what Viagra is and what it does and hear from some people who have already used this little pill that has literally revolutionised their sex life. It's up there with the likes of Nike, Coca-Cola, Pepsi and Microsoft as one of the world's most instantly recognisable brands. As the arteries in the Penis expand and harden, the veins that normally carry blood away from the area become compressed, restricting the blood flow out of the shaft. Under normal circumstances, when a man becomes sexually aroused or 'gets turned on', a substance called Nitric Oxide (NO) is released in an area of the Penis called the Corpus Cavernosum to relax and allow blood to flow into the Penis. Most men will have a problem getting an erection at some time in their lives. Very often it's another medical condition, possibly one you don't even know you have, that is causing ED. NO in turn

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