Capeguy

Interesting question. It appears to be  new variation that has come during the last few years. It is usually called 'breath control play' and is suppsoed to add something to the sex act. Some couples do it with light squeezing of the woman's throat. Taken to the extreme the man will actually choke the woman until she passes out due to lack of air. There can be real danger if you take it to that level as you can imagine. Without actually choking her, it can also be used to make the man dominant to the woman and control her.

And let me my ingeniudad, which has to do with what they wear around his neck?
You're telling me that they take him to keep them from breathing well? It does not make sense what I asked and the answer you have given me. All this with great respect for yourself.
That sexual practices have heard, I do not share, but hey each couple is free to have sex as they like.
To me it gives me the impression that some kind of signal, an indicator of something, they usually do in muichos private clubs, where you do not enter if not by personal invitation of partners, but might I have also heard many things, and my imagination can fly too.

Maybe I misunderstood what you were asking. A choker around the man's neck or girls wearing a choker on their neck? Sorry for confusion