There are two ways to increase the size of the penis.
The first involves lengthening the penis by releasing the ligaments, which attach the penis to the pelvis.
Approximately one-third to one-half of the penis is inside the body, and is internally attached to the undersurface of the pubic bone. Penis lengthening involves the release of the fundiform ligament and the suspensory ligament that attaches the erectile bodies to the pubic bone. The suspensory ligament makes the penis arch under the pubic bone. Release of this ligament allows the penis to protrude on a straighter path, further outward to give more functional length.
The second method, increasing the width, involves injecting fat suctioned from some other part of the patient's body, usually the abdomen. The actual increase in width is determined by the elastic limit of the penile skin, and is usually a 1-2 cm increase in shaft diameter.
To view before and after images of this procedure, click here
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Related Article: Penile Enlargement - Plastic Surgery Enters the Bedroom
Penile Surgery Information Resources
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Body Work - Steve's Phalloplasty
Please ask your doctor for further information.