"Prostate massagers are sex toys whose design allows them to provide stimulation to the prostate, a walnut-sized gland located between the bladder and the penis. As the prostate is positioned just in front of the rectum, prostate massagers are inserted anally. Often prostate massagers feature a tapered tip and a rounded head- this makes insertion comfortable and helps to locate and stimulate the prostate."
-JoEllen Notte, The Redhead Bedhead, from Stroking, Poking, and More! Toys For Penis & Prostate Pleasure (Read the prostate massager post on our blog)