Compulsory monogamy is the social expectation that exclusive two-person relationships are the normal or preferred form of intimacy, rather than one relationship choice among several.
Amatonormativity is the assumption that everyone should want and prioritize a central romantic relationship, often treating couplehood as necessary for a complete adult life.
Allonormativity is the assumption that everyone naturally experiences sexual attraction and should want sexual relationships or become sexually active.
Romantically rigid describes an inflexible approach to romantic expectations, roles, or relationship patterns, often with little willingness to adapt.
Romantically inclusive describes language, policies, and environments that recognize diverse romantic orientations, partnerships, and nonromantic life choices.