I am a big believer in the Aneros line of prostate stimulators. Check out their website at link for a great discussion. I believe their products are the only ones who have been issued patent in the industry today. You might also want to Google some medical sites to also learn more about the location of the male prostate; its exact location varies among men. I remember when my doctor was doing a rectal exam and he was checking my prostate I could sense a brief pleasurable stimulation. At your next exam you could just ask him exactly how may inches from your anal opening it is. On average I’ve read it is about a full index finger length in.