Navigating Unmarried Partnerships: The Power of Cohabitation Agreements in South Dakota In South Dakota, committed relationships often take various forms beyond traditional marriage. For many couples choosing to live together without tying the knot, understanding their legal standing and protecting their individual and shared interests is paramount. Unlike some states, South Dakota does not recognize common-law marriage (SDCL § 25-1-1). This crucial legal distinction means that unmarried partners, regardless of how long they live together or how they present themselves to the public, do not automatically acquire the legal rights and responsibilities typically associated with marriage upon separation. This is precisely where a Cohabitation Agreement becomes an indispensable tool for clarity, protection, and peace of mind. A Cohabitation Agreement, often referred to as a "Living Together Agreement," is a legally binding contract between two individuals who live ...