Before starting our conversation about Viagra, let us mention some facts about ED. You will be surprised to find out that healthy sex life is more than great pleasure and ability to have children. It is the best and only way to guarantee natural training of the male heart, lungs, blood vessels and muscles. It is also the most efficient way of restoring male central nervous system. Normal sex life prevents the development of such severe diseases as stroke, heart attack, discount viagra online high blood pressure (hypertension), diabetes, cancer, neurosis, depression, dementia etc. Now you know that men think the worlds of their erectile function for a reason!