Erections are entirely dependent on the ability of the body to focus blood flow to the penis. The size of a man’s erection depends on a lot of other factors, but its most important factor is the blood volume and pressure that goes to the cavernous spaces in the penis. To obtain a bigger erection, the body must be in the perfect condition to focus blood flow to the groin, which is what typically happens if you are sexually excited.
Penis enlargement works by manipulating blood flow through the use of ingredients that dilate blood vessels, and ingredients that increase libido. By dilating arteries that supply blood to the penis, it increases the volume of blood that flows to the organ. However, dilation also results in a drop in blood pressure. To counteract the side effect of dilated blood vessels, you need a strong aphrodisiac that would help trigger a natural erection. When a man is aroused, the brain sends signals to various parts of the body, to simultaneously contract and dilate blood vessels to focus blood flow to the penis. The end result is a much higher volume and pressure of blood to supply the cavernous spaces in the penis.
As the penis is an elastic appendage, the increase in pressure and volume would force the cavernous spaces to expand further, creating a bigger erection. Over time, the body would naturally react to the increase in blood volume and pressure by making the expansion permanent, creating a permanently bigger penis.