The penis is an organ that consists of blood vessels which expand under the influence of blood flow. Penis XL causes them to dilate, resulting in increased blood flow to the corpora cavernosa of the penis. This means that during an erection, for example, your penis is larger in both length and girth. The effect of expanding the corpora cavernosa is permanent. Penis XL does not contain any unnecessary chemicals - its composition is developed exclusively on the basis of natural ingredients.