Well-being is a big part of BDSM since it will often involve placing yourself in a vulnerable situation. Trust is, therefore, one of the key aspects of this sort of sexual activity. Generally speaking, consent for what kind of activity is being proposed will be discussed in advance with limits set as to what is allowed and what is not. Many people who take on a submissive role in a sexual act will have a safe word they can use, which should mean that the activity is brought to an end immediately. In short, it is a way of saying, “no” without saying, “no”. Where this is is not possible - perhaps because a gag is being worn, for example – an alternative method of communication will be established beforehand.