(See also Breath Control , Choking ) Commonly referred to as “breath control”. Refers to play involving control of or restriction of air and / or oxygen to the brain. Any form of stopping breathing freely including choking, smothering and hoods with tubes, sacks, plastics, etc, is asphyxia. Sometimes used to cause a more intense orgasm. Other examples would be strangling which is compression of the neck or throat area to prevent oxygen to the brain; suffocation involves reducing the level of oxygen available to breathe; hanging where the body is suspended by the neck (remember, all these games are extremely dangerous , either alone or with a partner, and may cause DEATH ).