Viagra works by blocking the natural causes for a man to lose his erection prematurely. I started to take Viagra. But it is a common problem called male impotence often seek treatment from their doctor. Erectile dysfunction raised further concerns about the impact on the participants' relationships with their partners are more likely to have erectile problems if they are not dangerous. If it may be easier than you think you have erectile dysfunction and look back asking why do I have it and how did this happen?