Penile Enlargement Surgery: Penile Pump - Version - Penis enlargement surgery entails cutting some of your body's ligaments; in this case the ligaments that join your penis to the underside of your pelvic bone. Roughly half to one third of your penis is hidden within your body, so by cutting some of these ligaments, more of your penis will be exposed. Thus giving your penile a longer appearance, or extending you penile if you will.