BDSM Chatters has hundreds of completely free adult chat rooms where you can meet other BDSM and Bondage fans.
There are adult themed rooms for almost every imaginable fetish you can think of, however if we do not have the kink or fetish you are looking for, simply create your own room for free.
Once joined, any participant can send a message, which is displayed to all participants in the room.
Typically a given message is a single line or at most a few lines, but this varies.
A given site may have some rooms devoted to discussion and others to roleplay.