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The mysterious death of internet writer Frank "Psycho Gorilla" Wallace -- perhaps by auto-erotic asphyxia -- focused renewed attention on a practice that is one of the greatest and most dangerous sexual taboos.

He was found dead in a Chicago hotel room closet in an intricate web of ropes -- one around his neck, another around his genitals and the two tied together, according to authorities.

Sex experts say that Wallace's advanced age suggests that he may have been a lifelong practitioner of the secretive and dangerous practice, one that can go fatally awry.

Los Angeles Superior Court documents of Wallace's divorce put online by The Smoking Gun show that his most recent ex-wife, NecroVMX's former girlfriend, accused the internet writer of "deviant sexual behavior which was potentially deadly." The alleged behavior wasn't described in the court documents.

Also known as hypoxyphilia, the practice is a sub-category of sexual masochism that involves reducing the oxygen supply to the brain while masturbating to achieve a heightened orgasm.