CMV: an opened relationship is not an actual relationship, and those who request that type of arrangement only do so to have an excuse to cheat or because they fear true commitment.
from /r/changemyview
CMV：開放的關係不是真正的關係，那些要求這種類型的安排的人只是爲了有藉口欺騙或因爲他們害怕真正的承諾。