@KoiwiGal - It's amazing how popular that drug is really, when you consider it's only been around for a short while compared with many other medicines.
But then, it's a miracle drug in more ways than one. I actually wish it would become more prevalent around the world, because there are lots of places with dangerous myths about treating erectile disorders.
For example, the people who poach a lot of endangered animals believe that their parts will make them more virile. If they had access to this other way to reclaim their erection, maybe they would leave the tigers and rhinos alone.