Screaming O Vibrating Ring
I couldn't even tell you why I got this. I'm not the biggest fan of vibrating cock rings, they just don't do it for me. HOWEVER, I write on this particular product because I found a very interesting and gratifying task it was capable of. Now, what you do with this is tie part of the ring off, and slide it around your tongue. The batteries last long enough to get several go-rounds in with it, and the whole thing is slim enough so that its not too cumbersome in the mouth. This is well worth the few dollars it costs and is the only way you'll get sensation without a pierced tongue and special jewelry.