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：开放的关系不是真正的关系，那些要求这种类型的安排的人只是为了有借口欺骗或因为他们害怕真正的承诺。