And, there are those of us for whom the pleasure of the activity (assuming it is a pleasurable one) overwhelms our ability to judge when enough is enough. We become unable to think about being sorry later. It's just like being very drunk. We don't think of tomorrow's hangover because we're having so much fun at the moment. So, we don't use a safeword because we don't want something to stop.......or lessen.
I'm still sitting very gingerly over a night of play nearly 3 weeks ago. Looking back, I realize we did too much that night, engaged in too many different activities, and it went on for too long. And truthfully, I remember that I was no help because I was begging and screaming for more. That has to be hard on a man's control. Furthermore, I'm a contrary bitch when made to stop. Kinda like a kid throwing a temper tantrum when my favorite toy gets taken away. But my mental state simply doesn't allow me to call a halt....or appreciate it at the moment if he does. The Dom should have been watching me closer.......and I've told him so since then.... but that doesn't help my sore ass now.
Safewords or objects are a great emotional crutch..... and I don't want to play without them and a Dom's total respect for them.......but in reality they're often not very effective. I just go off in a headspace where logic, reason, and any sense of responsibility disappear and I need someone watching me who MAKES me stop.