searching for cheap viagra? 50mg viagra for sale online "The mechanisms underlying the association between RLS and erectile dysfunction could be caused by hypofunctioning of dopamine in the central nervous system, which is associated with both conditions," said Gao. "Men may start out being sexually active, and then as the radiation scarring and damage develops over the next two to three years, there's a gradual decrease in the levels of potency," Brooks said. "With surgery, it's the opposite. There is some initial difficulty, and then things improve over time." The survey did not ask volunteers if a doctor had diagnosed either of the disorders, only about related symptoms, which is a weakness, said Dr. Thomas Pollm?cher, the director of mental health at Ingolstadt Hospital, Germany.