Gags - personal experiences
I have often been gagged as part of a BDSM experience. Gagging is something with profound implications. The captor is humiliating me by implying that I have nothing to say, or at least that nothing I have to say is important.
There are three aspects to this. It stops me protesting at whatever she is doing to me. Equally, I cannot admit defeat. If I want to say that I have had enough, that I surrender, I can't. (Of course, in an emergency I would have a release signal, but I try to forget that.) I have to accept the full range of discipline or physical punishment that she chooses to mete out. Finally, gagging converts me to being an adult baby. I can't talk coherently. I can, like a baby, make a noise, but that will only annoy my captor.