Self Bondage + Masturbation
There are many ways that one can self bound to achieve that heightened place you want to get to to achieve the best orgasm ever.
kink
Erotic Electrostimulation: The Risks and Pleasures of E-Stim
If the first image that pops into you head when you read the words erotic electrostimulation (e-stim) involves a torture scene replete with a cattle prod wielding sadist and a tied up victim, you can forget about the cattle prod.