They'll say you are bad or perhaps you are mad or at least you should stay undercover. Your mind must be bare if you would dare to think you can love more than one lover.
Designer relationships are based on egalitarianism and mutuality, not on proprietary thinking. From this perspective, if people decide they will have multiple partners, the approach is the antithesis of cheating. In the conventionally monogamous model, each party owns the other (a modern variation on the more antiquated view of woman as property). In designer relationships, each party voluntarily owes the other transparency, some measure of emotional loyalty, and a determination to abide by agreements.