Ethical Non-monogamy or ENM for short is a term used to describe various structures of relationships that at its most basic are two individuals being romantically and sexually non-exclusive with one another. A key part of ENM is that all parties are aware of and agree to the structures they negotiate together. Some types of relationship structures are Polyamory, Open Relationships, Swinging, Solo Poly, Mono/Poly Combo, Relationship Anarchy, and more. Some key differences to consider.