Reportedly, there is also a pair in which one contains a drop of mercury and the other, a

tiny vibrating metal tongue, giving a uniquely erotic sensation even at the slightest movement of hips or legs (Sex in History, Reay Tannahill). They are used by inserting them into the vagina or anus and using muscles to hold them in, and movement to stimulate and vibrate.

Holy Wikipedia!

Posted By: Tombs, May 22, 10:03:44