Interesting topic. I remember before I started using Heroin, my homies would tell me about the Heroin Hard On and I was like WTF? A few years later I got hooked on the smack and I met a little honey from Texas and I moved in with her about a week after I met her. I took her to the bone yard and my dick stayed hard the entire time we banged. I then remembered what my homies had told me about the Heroin hard on. It was true. I never felt more like Superman than I did that night. I have never used Viagra and I know nothing about it but if you are going to be with a biatch all night long, then you have nothing to lose but a few hours of sleep. I say go for it and then come back and tell us if it worked or not.