I'm afraid as a nurse I have to warn against it. ANY oxygen deprivation or drop in saturation levels to the brain and other vital organs including the heart can lead to long term damage especially as nuerones in the brain are unable to repair themselves.

Brain damage doesn't happen all in one go but drops as little as 2% in blood oxygen levels start damaging neurones. I used to have an interest in this myself but through my nursing career learnt the risks. An alternative suggestion which we have used instead which provides a similar feeling is pressure on the chest (weight and prolongued eg body weight from lying on someone not for example punching), being forced to drink, or punishment for not holding breath for a certain length of time

but to summarise it is erotic, it does give you a buzz but it is very dangerous in many ways!