I am interested in unusual things like asphyxia or as some call it erotic breath control. There are many ways which makes this happen.
First, it seems to me there are sites available on the net which one can refer to so I will not try to duplicate those. I have a number of stories I have written at some of these sites.
You can start with the site administered by Gallows_25. That site gives you warnings about the actions, particularly when practicing alone. I know men on the lists or clubs who have accidentally died while trying out their fantasy and so I do not advocate it. Moreover, I have never tried this with anyone so please do not think of me as a pervert who might get into a bad situation.
I also have experienced once bondage which was enjoyable. I am not into any form of pain BUT I will explain the bondage experience to show you haw erotic it can be. In this instance, my friend had just picked up leather wrist restraints and ankle restraints and leather ties to tie the restraints together. When he started to bind me, he put the leather wrist restraints on first with my hands behind my back.
He was extremely careful to make sure I did not lose circulation in my hands as he had had one bad experience himself with circulation in his hands. He kept his own bikini briefs on but I was naked standing with him behind me. He massaged my shoulders, neck and upper back with a beautiful and deep massage. During the time he was massaging me, he slipped down and did my legs and got the ankle restraints on too, tieing the ankles about a foot apart. He then stood up and played with my cock and kept massaging.
In the meantime, my hands cupped his cock and balls encased in his briefs and he was leaking pre-cum in the gallones, soaking his briefs and my hands which were cupping his jewells. Eventually, he moved me to the bed and threw me down on my stomach and tied my ankles to my wrists. It is difficult to keep one's head high enough to breathe if left on a soft bed for a long time BUT he again kept asking me if I was OK.
I was feeling great all over and would never ask him to stop playing with my whole body while I was tied up like that. We switched places many times that day and BOY would I ever do that again. This scene has been a fantasy of mine ever since. Note it did not include any sexual penetration but was more erotic than oral or anal sex sometimes becomes.