Appreciation of the type and frequency of normal variations is important because branching patte군 of internal pudendal artery(IPA) are highly variable and frequently differed from the classic description of anatomy. And these variations could be easily confused with arterial obstruction or abnormality. We analyzed 34 normal internal pudendal arteries from 17 men who were not believed to have arteriogenic impotence. The technique of studies were superselective IPA selection of catheter, and simultaneous infusion of intracavernosal and intraarterial papaverine with intraarterial lidocaine, under local anesthesia. The type and frequency of variations were 2 cases of hypoplastic dorsal penile artery(DPA)(6%), 1 case of one penile artery supplying both DPA(3%), 2 cases of accessory IPA(6%), and 4 cases of two DPA from one IPA(12%), 19 cases of two or more deep cavernosal artery from one IPA(56%). The overall frequency of both normal IPA in one man was 17.6%(N=3 from 17 men). We wish anatomic variations and frequency should be fully recognized to avoid errors in interpretation of penile arteriography.