People obviously have different expectations for their relationships.
Marcus expects to go with the flow as relationships change and shift and end or whatever, and expects his partners to do the same, in keeping, I'm guessing, with the "anarchy" part of his relationship philosophy.
Magdlyn expects herself and her partner(s) to continue meeting each other's needs, including that for social acceptance and love, throughout the relationship, regardless of other factors and circumstances.
Well, no. Not regardless of everything. Illness, a death, new baby, massive overtime at work, other highly stressful life events, sure, sex can wane. I am just referring to polyamory, and new partners, NRE, overshadowing and eclipsing the needs of the established partner. That is just rude, IMO. And manners are important, dammit.