Huh, interesting. I'm still not sure how that would work for me -- I get "involved" whenever I'm close to someone, in the sense that my friends are very, very important to me. I have three or four (depending on whether family members count) friends with whom I exchange "I love you"s, hugs and intense emotional support (as in, they would be there for me if I were having a panic attack or other serious problem, and vice versa), and to me the difference between my relationship with those friends and my relationship with my husband and Master is mostly one of priority -- i.e., if it was between helping one of my friends and helping him, I would help him.
Just curious, in your life is their such a difference? As in, "I have multiple partners, but this one is the highest priority to me?" Or is everyone basically equal?