Studies show that 67% of men who are 70 years old have erectile dysfunction problems, while the ratio is 39% for men who are 40 years old; this means that there are approximately twenty million men have erectile dysfunction problems only in united States, therefore, with these rates, the problem was studied for many years, and there was different types of treatments, some of them were oral medicines, while others were physically, even some times it is surgically. But, to understand all of these treatments and the techniques they use, and to know the causes of erectile dysfunction problems, we should firstly understand the basic physiology of erection, or in other words, how it works. Continue reading →