For me it is important to let the 3rd person know that they are getting into a “Secondary” relationship to be sure it is what they want. My “Primary” relationship is a very involved one and we have major and minor life decisions that we make together, they may sometimes affect our “Secondary” but they are our decisions to make between the two of us. Why would we want to add any stress to our “Secondary” relationship, I think “Secondaries” should be more about enjoying life simply