A page on the Sex as Nature Intended It website describing the sexual function of the foreskin. This page provides simple tests that people can take to see how the foreskin functions. For example, the page describes how to feel the difference between fine touch nerves and pressure sensitive nerves by touching the lips and cheeks. The intact penis has both fine touch nerves and pressure sensitive nerves. Unfortunately, circumcision removes much of the fine touch nerves and if the shaft skin is tight, prevents the proper stimulation of the pressure sensitive nerves.