Domination and submission. Is it part of BDSM or the Alternative Lifestyles if not Eroticized/Romanticized?

There are many every day examples of Domination and submission (D/s), for instance; Teacher and Student, Boss and Employee, Parent and Child, Government and Citizen being the most common and prevalent. The question is, are these relationships part of BDSM or the Alternative Lifestyle(s) when without the Erotic or Romantic elements?