I've played solo breath control sessions for years (suffocation only, no ligatures around the neck and nothing restrictive that I couldn't easily get out of) and for years I've fantasized about being restrained and someone taking me all the way to the point of passing out ... but in reality I don't know if I could tolerate it or not because the body's natural survival instinct would eventually kick in and I can't help but wonder if at that point the fantasy would stop being "fun".
There's probably quite a few people that fantasize about being suffocated to the point of blacking out, but the reality is how many would actually "enjoy" it once the panic mode sets in?
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Fear, anxiety, arousal & pain; all are emotions & sensations. Feel them, experience them, surrender to them & learn to accept them.

~AynsToy