i had another friend and he had started using it from the same doctor as mine. he and i had an appointment once on the same day with his just before me. our doctor was so cool so we both went in together. i discovered why he only needed about 1/2 what i was taking. let me say size is not important. in fact an overly large pecker may be far more trouble than one of say average size of about 6 to 6 1/2 inches. once you cross over the the 7 inch mark does prove interesting. he was 6 3/4 and i was at 8 3/4 thus it 