Wondering how to use a Wartenberg wheel, or even what a Wartenberg wheel is? It was invented by Robert Wartenberg as a medical device to test sensitivity of the skin. The kinkier variety of people use it for tingly sensations on the skin.
Run it across your partner's skin lightly for a tickly, tingly feeling. Push harder for a spiky sensation. Or use it after some spanking or flogging for a more intense feeling.
How do you like to use your wheel?