A retrospective study was carried out using sexual case histories, hormonal profiles, vasoactive drugs test, dynamic cavernosometry and cavernosography on 46 patients who underwent radical cystectomy (26 patients: 57%) and radical prostatectomy (20 patients: 43%) for neoplasia, conducted by means of traditional surgical non-nerve sparing methods, in order to characterize the type of damage affecting the erectile function as a result of surgery. The study was carried out at a minimum of 2 months, a maximum of 9 years and 5 months, an average of 2 years and 6 months, after surgery. One patient (2%) reported intact erectile function and withdrew from the study. 37 patients (80%) showed neurological damage, while the remaining 8 (18%) had prevalently vascular damage.