Master/slave relationship - Refers to D/s relationships; this acronym stands for Master and slave. It refers to a type of relationship that is a serious commitment, often long-term, and in some cases may be consensual non-consent. While this is not true of all M/s relationships, a large majority of them are involved 24 hours a day, 7 days a week (also called 24/7), and have detailed contracts or agreements. This relationship is often refered to as a Total Power Exchange (or TPE) relationship.