Sue, I am sure there are more than a few folks hereabouts into non-vanilla fun and games. Maybe more openly explored in The Realm forum https://www.eccie.net/forumdisplay.php?f=792 and I have heard of "auto asphyxiation" incidents and deaths in the "civilian" world.
Not my cuppa tea, as noted above, but when a lady asks and instructs I usually cooperate when the moment feels right, or, I decline.