What is the main cause of erectile dysfunction?

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Iron Man Stamina is a self-help guide for men who are dealing with erectile problems. Not every erection problem is erectile dysfunction. Not every man can have a strong and lasting erection. Even the most sexually active men will have to deal with situations when the erection will not be strong enough or will not last sufficiently long. This happens to men of all ages, regardless of genetics, ethnicity, overall health and choice of sexual partner. It is only natural for men to have erectile problems. IMS™ is authored by Tom Crawford, a chemical engineer from Raleigh in North Carolina. Crawford has had to deal with erectile problems himself that left him embarrassed. His shame lead him to a pursuit for a cure, not any surgical process but a sustainable way to restore the strong erection that all men should be able to attain. All the findings and revelations of Crawford have been documented in this guide that can alter the lives of millions of men.

http://www.youtube.com/watch?v=cIkg8DAsT38