prior surgery in the last 6 months which could affect sexual function;

history of Peyronie's disease;

significant neurological disorder (i.e. multiple sclerosis, peripheral neuropathy);

treatment for major psychiatric disorders;

history of penile implant or prosthesis;

history of diabetic neuropathy;

life expectancy of less than two years;

concurrently involved in another investigational study;

uncontrolled hypertension with systolic BP \>200mmHg or diastolic BP \>115mmHg is present at screening;

currently receiving or planned treatment with chemotherapy or radiation therapy;

diagnosis of bony metastasis;

known allergy or severe intolerance to PDE-5 inhibitors; or

cardiac pacing equipment or other electro-mechanical devices which preclude the use of CaverMap™ neurostimulator.

Study of Nerve Reconstruction Using AVANCE in Subjects Who Undergo Robotic Assisted Prostatectomy for Treatment of Prostate Cancer