These days the news is full of stories about improper sexual advances made by a man to a woman. Ironically, in our fantasy world there are a few special women who want and need to be treated like a piece of meat for their Master's pleasure. If such pleasure includes pain, humiliation, degradation even better in the sub's mind. I've found that there are subs who have a whole list of things they want to try as their confidence and trust develops. The sub may not be able to tell the Dom about everything at first or how much further they want or need to go until this trust develops. I don't believe it is good for the Dom not to encourage and support the sub in these explorations. I believe part of the trust is a high level of communications both verbal and nonverbal between the two so that things can proceed smoothly until the sub no longer feels comfortable. Using a safe word is not a failure but a building block of that trust and growth of the sub's confidence in herself and her Dom. There is nothing more magical than the sub who says "do anything you want to my mind and body just keep me safe". I am not sure that such a woman exists anymore.