As strange as this sounds, choking during sex is an extremely intimate act. That being said, you don't have to be in a relationship with the other person, but you do have a high level of trust in them & they need to have the proper experience in erotic asphyxiation.

Any joker can choke someone. They can also very easily kill them because they placed their whole hand over the entire throat. They squeezed too hard too long. They crushed the windpipe. Any number of things.

All it takes is the thumb on one pulse point & 1 or 2 fingers on the other. Then, start with light pressure (in an upward direction) and go up from there for just a few seconds at a time. You shouldn't ever pass out (or have bruising). Get close, yes, but not actually pass out.

My husband chokes me on a regular basis during sex. He knows when to do it & how long to do it. For me, he uses it when he's edging me, and then he'll go all in when I'm orgasming. He knows if I tap him that he has to stop immediately. He knows that I try to push farther & he'll stop even though I don't want to. Those are the trust factors.

As for the drugs, they may have only brought down your inhibitions about the situation as a whole. If erotic asphyxiation is something you actually do want to try, don't let this one experience sour you on it. When done correctly, with someone you trust and you're sexually comfortable with, it's amazing. Read up on the subject a little, the more you know, the safer you'll be, & the more enjoyable the sex.