I am far from a dominant, but since this is on a wide forum, and i wouldnt mind giving my two cents....i'll say..Lol.

Since i havent been worked so hard, to the point of me having to use a safeword, I cant say about disappointing. But i do know, if i needed to say it, It has to be safe. If not it can be very costly, to the both of us. Not wanting to disappoint is a big thing with every submissive, we want to "act" as if we are the toughest, able to take the longest beating, or maybe fucking. But we are only human and we cant please everyone, no matter how hard we try. Our Dominants would want us to be honest with them, why prolong something if it stops being enjoyable for you? Just to scratch some Sadist need to beat? Lol..Or maybe getting a long hard fucking in the ass? When it stops being enjoyable, thats when we have to sit down and talk about this.

A Dominant has to know his submissive. He has to know when she maybe losing abit to much O2 because of a gagged mouth, or maybe if a beating is to hard for a small frame. Or even for most, including myself...being tied up and the ties are tight and binding without some circulation. Thats where trust, communication and being honest with your Dominant comes in. The "all knowing" and Loving Dominant, wouldnt want to damage his property, so not being honest with him when something has become to much...ahhhh it could hurt his feelings.

I know for some it takes time to really know a person and know what they are able to take. Thats also where trail and error comes in, I know i cant take a caning or really heavy beating, while others can. *Pouts* i know sad but true Lol. But give me a long hard fucking...i am in heaven!!!! *day-dreams*

as i said before, i know the question was directed towards Dominants. but from my limited experience...Knowing your Dominant/submissive makes all the difference with issues of safewords....