Of course, it’s more exciting if someone else has the key or combo.
By Unknown
There is a chain locked around my neck, symbolizing that I am owned, like property. It’s a mark that someone has claimed me. I can’t take it off. I eat, sleep, shower, exercise, relax and basically live my life with it locked around my neck.

And a heavy chain collar and padlock:

I bet being locked in this metal collar is a real challenge. I wonder what this prisoner at Serious Male Bondage would say about his predicament after, say, 10 hours in this?