Autoerotic asphyxiation
Autoerotic asphyxiation is the (usually) unintended death by strangulation while masturbating. The decrease of blood to the brain is said to heighten the sexual pleasure.
It is a popular subject in tabloids and celebrity gossip magazines, particularly when a celebrity dies as a result of suicide or other mysterious circumstances. Such was reputedly the case with the deaths of Jerzy Kosinski (in 1991) and Michael Hutchence (in 1997), though no evidence to support the claim was produced in either case.