All you have to do is google yourself. A quick look at wiki for erotic asphyxiation shows references to articles written in the 80's and 90's talking about it.
Some people like having sex under the covers with the lights off. That is fine. But there are others that like to live a little. Check out some of the bdsm websites out there. Trust me when I say there are some interesting things people are into. Choking is one of the tamer ones.
As a student at a university back in that time, i can assure you, it was a thing.