We examine whether the playfulness of adult domestic dogs is a unitary phenomenon, or is heterogeneous and the consequence of diverse selection pressures. In BDSM, Master/slave or M/s is a relationship in which one individual serves another in an authority-exchange structured relationship. Unlike Dominant/submissive. Jan 24, 2015  · I’ve had some fairly lively discussions as of late with Sir as well as with writers and readers on Facebook. I think given…