When practicing femdom torture it is extremely important to have safe words that your submissive can use. There can be multiple levels of these safe words for example green could be used by the submissive if they wish to increase the intensity, pressure, or force of the activity being carried out, yellow could be used to indicated that the dominant is reaching an intensity level that he doesn t wish to experience and would prefer that the dominant discontinues in this direction. Red is the safe word that can be used to mean stop. When used the dominant partner should immediately stop what they are doing and release the submissive.
This color safe word mechanism is known as the stoplight and is the most common system to be used in BDSM. The stoplight system is recognized all over the world and is by far the safest one to use.