As we stretch, expand and deform the penile skin and tissue many things are at work. Increase blood flow to the Corposa Cavernosa and Corpus Spongiosum, through Penis Enlargement exercise, micro-trama in the cells occurs. When these cells repair and rebuilds, a penis will increase in length and girth. Along with tissue expansion the actual veins and capillaries actually become larger and able to hold more blood. The body is amazing in this way, if part of our body becomes larger the supply of blood to the area will increase. There are records of people who have had tumors that have gone many years without treatment (some reaching twice the body weight of the afflicted). In the cases that these tumors are removed and studied the biopsies are amazing. There is a huge network of veins, capillaries and arteries that have forged their way to the tumor to supply blood, some as thick as 3" in circumference! The penis, as with any living tissue, is supplied with the amount of blood necessary for proper function. As it grows so does its blood supply and the pathways that bring this blood.