
Electro (a.k.a e-stim, electrosex, electricity) is a means of sexual stimulation using specially made electrical devices with attaching electrodes for different parts of your body. It's possible to remain on the verge of orgasm for hours on end, until the stimulation is adjusted to produce an orgasm.
How is it done?
There are several devices you can buy to do this with. These include a TENS unit (normally designed to manage pain, but it can produce this same stimulation). Another way is to use a special circuit connected to your computer and stereo outputs, commonly called stereo-stim. This special circuit converts the audio signals coming out of your stereo into electronic pulses that stimulate your cock/balls. The outputs of the eStim "source" are connected to electrodes which in turn are attached to the areas of your body you want to stimulate. This can also be extended to stimulate your prostate as well, but this is all dependent on one's personal tastes.
How does it feel?
The sensations are unlike anything you have felt before. They can be highly pleasurable, erotic, tactical feelings, and they are different from one type of electronic pulse to the next. These sensations simply can not be produced by squeezing, stroking, or any type of pressure or friction. In fact, initially they take a little getting used to because they are so different. But after one or two sessions, they can take you to places that you never knew existed, for hours on end.
Physically, electricity can produce a complex variety of sensations, and every sub who has thought about the subject has their own idea of what it "should" feel like. If your subject enjoys the psychological trip, setting up a scene with all of the trappings of a torture session and applying mild stimulation while letting the subject's mind do the rest can result in a very intense experience. Of course, if you and your subject are into more intense pain, electricity can provide more pain than most subs can tolerate, without leaving marks, scars, or (if done carefully) damage. Aside from the pain and fear aspects, direct mild electrical stimulation of the cock, balls or prostate will produce intensely sensual feelings, usually to the point of orgasm.
Safety
NEVER use electricity above the waist, period.
Never use electricity on a person who has a pacemaker.
If you're playing with someone else and using rope or bondage, don't tie your subject too tightly. Allow some room for muscle contractions. Also, make certain that your subject is bound or positioned such that a sudden movement won't cause a fall or other unintended injury.
Make certain that your electrodes make good contact. Use plenty of electrode gel. Poor contact will often cause burns. They also tend to have more damage beneath the surface than is immediately obvious.
I strongly suggest that when you try this for the first time, you test it on yourself. This will give you some insight as to what the sensations are and what constitutes a tolerable level of current. This leads to a warning: NEVER experiment with electricity on yourself unless you have someone else present in case of an emergency!
TYPES OF ELECTRICITY
TENS units
Probably the most popular device is a TENS unit (Trancutaneous Electro-Neural Stimulation), which is the medical term for a device frequently used by chiropractors and other medical professionals. These are powerful units, and are quite well made and are very safe if properly used.
There are several companies that sell Tens units including PES Electro and Folsom. You just need to decide which electrodes to purchase. There are electrodes for use on your cock, balls and even prostate electrodes. Normally you can have up to 4 or more connected at once, depending on the unit and type of electrode. (Imagine how good it would feel to have one electrode wrapped around your cock, one tied off on your balls and one massaging your prostate, all at once!)
Violet Wand
This gadget uses a high-frequency circuit similar to a Tesla coil to build up a static charge in a gas-filled glass tube. If you hold the tube near your sub's body, a charge builds up enough to jump the gap and a spark jumps from the tube to his skin. Unlike shuffling across the rug, though, the Wand can spark many times a second. You can adjust the intensity and rate of sparks depending on your purpose. The nature of the body's response to this type of charge is such that you can use the wand anywhere on the body except for the eyes.
Exactly what path you want the current to take through your subject's body and how you connect the current is dependent on what effect you are looking to obtain. The smaller the electrode, the more strongly the current will be felt as a tingling or stinging at the electrode site. Therefore, with a small electrode, the sensation at the contact point is likely to reach your subject's tolerance limit before much is felt in the area between the contacts.
A large electrode will produce little sensation at the contact point, and more in the area between contacts. The number of different types of electrodes that you can make or buy is limited only by the kinkiness of your imagination. Remember though that a poor electrode-to-skin contact can cause painful, slow-healing burns. Most people do not consider this enjoyable, so make sure that your electrodes make good contact, and adjust them if your subject complains of burning.