Basically the bdsm community strognly believes in the significance of a safe word and it is obvious that a dom who forbids his sub the use of such a word has got anything else in mind than his subs wellbeing.
It is however so that I had never had a safe words in my former relationships, not because I didn't believe in it, but first of all because it didn't come into our mind. With my first bdsm partner I had been leading a long relationship before whe have entered into the bdsm world together and very slowly. We could read each other's mind and there has always been a lot of coummunication about how a scene would be played in the beginning.
Well, this certainly is a very beautiful was of living bdsm, not because the lack of a safe word enhances the dom's power, but because such a relationship shows how close two people can melt together, how eternal trust is and how important the sub's happiness is for her dom.
I anyway lov the thought of a man being able to read the woman's mind, to see her feelings and mood before she realizes them herself, so that he will always create the atmosphere in such a way that she feels beautifully loved and taken care of, be it in vanilla or bdsm.
It is however so that if I entered a bdsm relationship now (Silvie, if you read this, please catch my virtual kisses; I adore you), there definitely had to be a safe word, as it takes long time until two partners come so close that there is 100% certainty of no misunderstandings. It is however so that I first of all believe into the necessity of communication and the necessity to first give warmth and love to a partner before it comes to bdsm. I am not the one who could see bdsm as a technical process to satisfy any needs; for me it can only happen in a partnership, in which love, care, respect and warmth are the most important feelings.