The penis consists of a “visible” external part, and an “invisible” internal part that is buried inside the suprapubic area. The base of the penis is attached to the pubic bone via the “suspensory ligament”, which prevents the penis from moving further out and provides an arched angle to the penile base area. The release of the ligament allows a) the internal part of the penis to move forward and outside of the pubic area, and b) changes the angle of the arch, providing further stretching of the penis. Hence the “outside” segment of the visible penis is increased in its proportion (compared to the segment inside the body) providing and average gain in penile length of 1 to 2 inches.
However, there are unfortunately severe drawbacks and potential complications with this method of penile enhancement.

Scar tissue formation and consecutive retraction with loss of penile length
Minimal pain, swelling, and possible bruising after surgery
Infection of the surgery site is a very rare possibility (covered with antibiotics)
Variable to no results
This is why the American Urological Association considers the division of the suspensory ligament for penile augmentation to not be “safe or efficacious”.