The chemical steps may or may not be known. What is known is that you can change brands and get a tranquilizer that doesn't cause problems. A bit young. But we all go through phases. Trying to finish college too.
Men are often less direct in knowing what they want than women.
I don't know why. We seem to spend a lot of time floundering around. There's one coming up for testing soon that claims to have none of Viagra's small side effects. But it will probably have its own. Because of federal testing, we are probably at least two years from seeing competitors on the market.