I was listening to this Dr. once on some sex show. Some guy had called in saying he was having erectile dysfunction and was asking about viagra. So they dr. started asking him a few questions here and there to try see if he was the right candidate for the pill. The guy started to talk about how his sex drive was down and what was causing it. The Dr. says to him, "if it's your actual sex drive that's a mental issue which maybe caused by some life style factors , drugs, stress, alcohol, etc....but went on to say it won't do any good. He said "I can give a dead man and erection. The drug is great if it's a physical problem, but if it's a mental issue, not much you can do other then change life style.