Marriage between a Swiss and a foreign national is perceived by the law as a vehicle for integration. Under this principle, naturalization policy legitimizes “facilitated” access to Swiss nationality for foreign spouses. However, these unions must follow a highly normalized matrimonial model. This paper aims to uncover the normative logic of marriage in Switzerland by analyzing what makes it suspect both legally and socially. In order to do this, we analyze the legal cases in which naturalization is annulled on the grounds of dissolution of marriage. We show that, in response to the protection of Swiss nationality, the control of naturalization facilitated by marriage represents an instrument for combating undesirable family models identified in binational couples, considered to jeopardize the imaginary of national cohesion.