My husband has had all the tests done by his GP and is healthy, is not on any medication, is 75 and since we've been together over five years has never reached orgasm. His erections don't last long enough. He tried viagra many times without success and they give him severe stomach ache. He was single for 16 years before we got together and didn't have a sex life during that time. We've got over the anxiety stage, which might have affected performance. We both just want a normal sex life which results in climax. Will this drug work?