Auto-erotic asphyxiation (AEA) is the practice of cutting off the blood supply to the brain through self-applied suffocation methods while masturbating.
By limiting the blood supply to the brain, AEA can induce cerebral anoxia, a deficiency of oxygen in the brain.
Oxygen deficiency in the brain is thought to intensify sensations, producing feelings of giddiness, lightheadedness, or exhilaration that can heighten the orgasmic experience.
It's also possible that the helplessness and self-endangerment inherent in the AEA enhance sexual gratification for some people.
Of course, this same self-endangerment that may provide a thrill to the person carrying out AEA also weakens one's self-control and judgment, which can result in accidental death like you see above.
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