TENS, or transcutaneous electrical nerve stimulation, is a back pain treatment that uses low voltage electric current to relieve pain. As it happens, it also can be used to produce pleasure when it’s in the hands of people like Sunny Megatron and Ken Melvoin-Berg. They introduce the device and talk about the theory behind it, as well as the associated safety issues. They also bring out some interesting toys such as dildos that can also be used with the device.