TENS unit
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A TENS unit is an electrical device which applies electrical signals through pads affixed to the skin, commonly used in the medical community to relieve pain by blocking the transmission of pain impulses through the nerves. Stands for "transcutaneous electrical nerve stimulation."

Used in BDSM as a form of electrical play. A TENS unit can have an effect ranging from a mild tingle to a very strong sensation, depending on how it is used. It can also cause involuntary muscle contractions. Some TENS units used in BDSM play include electrodes designed to be inserted in the vagina or anus; some people find that the vaginal contractions induced by a vaginal TENS probe can cause intense, long-lasting orgasms.

links and references

http://arthritis.about.com/od/assistivedevicesgadgets/g/tensunit.htm

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