Let me remind you that my guest is not a medical doctor. He recommends you consult your doctor for any sexual dysfunction problems. That seems to be what they're going to do in Britain, but that creates a drug black market. That may be the deciding factor here. No one really knows.
Every drug has side affects with long term use.
No one knows Viagra's. About 80 percent of male impotence is physical, not psychological. The commonest illnesses that cause it are heart disease and diabetes. But sexual problems can just as often be caused by poor diet, lack of exercise, and being a couch potato. You don't need Viagra for that.