In longer, committed relationships many people opt for the Master/slave model, in which consent is negotiated once for a long period and the consent given is generally broader. Some people opt to be purely "sex slaves", while others who prefer domestic service identify as "service slaves". Some slaves allow their Masters or Mistresses complete latitude as to the demands that can be placed on them. Such a relationship is known as "Total Power Exchange" or TPE.
It can be one of the most difficult relationships in the BDSM world to maintain, and requires special skills and experience.
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