Bill,
Thanks for your reply - I certainly agree that in some cases the problems may well be due to anxiety, however some of the (worrying) symptoms involve reports of very watery semen, reduced spern mobility and low levels of testosterone. These symptoms can definitely not be attributed to a psychological effect (No matter how much you worry about your semen, that won't change its viscocity!) If the medication can have an effect on these properties, it would be no surprise if the erectile dysfunction is also due to the medication's effects, not to mention the fact that the changes I mentioned without any erectile problems would be enough of a concern for anyone.