asphyxiation is the main cause of death, although its much rarer than people tend to think and even in those cases its usually when people do self strangulation by hangings etc.
i love breath control and strangulation but other than the rare occasion of using such as a belt Icehawk uses his hands we are very aware of the risks and while he can try to minimise them they are still there and it is dangerous.
i dont want to be a killjoy bc can be extremely erotic especially when done at the time of orgasm and can be one of the biggest power kicks for the Dom/me.
this is quire a helpful site and has quite a few helpful articles and links by people well known in the lifestyle both practical 'how to' advice , medical and safety issues if you're interested
http://public.diversity.org.uk/devia...ath.htm#Safety