One is for Arteriogenic Ed:  happens for older and diabetic person , in this  Blood didn’t flow at all , so erection won’t come.Second is Veinogenic Ed: happens in younger age, in this condition blood flow but it didn’t stay long so erection comes but not for long time. Mean erection on/ off, Third ED happens for those who masturbate, in this condition blood flow but not getting sufficient erection, sponge tissue not gets the full erection. This condition we called Endothelial Dysfunction.Penile Girth, Does Penile girth is really important to have...