I am aware that the answer to this can be different based on the sub so please think of the sub you are with or the last one you were with to base your answer on.
I have had several subs tell me that when it comes to safe words that they shy away from using them even when they need to because they are afraid of disappointing their Dom. Or in some cases they just get so far into what's going on that it never even occurs to them that there is any such thing as a safe word even when the pain is unbearable. In my case, the one time I needed it I forgot what the word was. (Yelling "I forgot my safeword" worked well that time. hehehe)
So my question is......As a Dom/me how do you handle this? Do you just keep going unless a safeword is used? Or is there some sign that you look for or notice that things have gone too far and for whatever reason your sub hasn't safeworded but needs to stop? What is something ie. facial expression, noise, etc. that your sub does that tells you that it's time to stop even though they havn't said their safe word?
The biggest question of all.....How many of you honestly weren't aware that subs sometimes won't or can't use their safe words, even when they desperately need to?