T is for TENS
TENS is short for Transcutaneous Electrical Nerve Stimulator. It can be used to relieve pain or, as we kinksters have found
out can be used to elicit either pain or pleasure on the “victim”. These units can be very expensive or relatively inexpensive in the form of a hitachi wand or, if you want the full experience, try the full TENS unit. A great description of the use of a TENS unit is found in at another great kinky blog.
If you want to take a look at one of these TENS units, check them out here (Expandable beginner kit). There is even an intro to TENS video here