So coffee is poison to sex life in older men. Theophyline is from our common tea. Theobromine is from Cacoa. Theobromine has been and to some extent continues to be used in medicine as a diuretic, a myocardial stimulant and a dilator of coronary or peripheral arteries. Older men all suffer from varying degrees of articular sclerosis in that pathway leading to the penis.
Blood is what pumps up the erection.
The main one being the Cacoa. It works by triggering the older human body to produce hormones. Kind of like a fountain of youth. And not foreign to the body, but produced by the body. One hell of a difference.