Veto Power

Veto power is one of the most-debated structural rules in non-monogamy. In its strongest form, either member of an established couple can require their partner to end an outside relationship, and is not necessarily required to give a reason. Weaker forms reserve veto for safety concerns, hard limits, or situations where the outside relationship is destabilizing the original one. The structure is most associated with hierarchical polyamory and with newly opened couples who use it as training wheels (Wikipedia).

Established polyamory writers and educators are generally skeptical of veto. The argument, summarized in long-running essays such as those at More Than Two, is that veto power treats outside partners as disposable additions to a couple rather than as full people with their own stake in the relationship, and that it places fear-based control where trust and conversation should sit. Critics point out that the existence of a veto can itself prevent partners from raising concerns honestly, since every concern carries the implicit threat of ending the relationship.

Veto remains common in swinging-adjacent open arrangements, where the goal is shared sexual play rather than independent romantic relationships, and where the lower emotional stakes make a "this isn't working — we stop" rule feel less drastic. In committed multi-partner relationships, the contemporary trend is toward replacing veto with explicit influence ("I get to raise concerns; we decide together") or with safety-only veto, which is invoked only over genuinely dangerous behavior rather than as a general lever of control.