Wikipedia says –
Erotic asphyxiation or breath control play is the intentional restriction of oxygen to the brain for sexual arousal.
I love the feeling of my Master’s hands around my throat. He has never restricted my oxygen for any length of time. Apparently, if a person comes near to passing out, then the sexual arousal is heightened. I’m not sure that I would really want to pass out. I just like the feeling of loss of control.