Extramarital union, as a form of partnership between a man and a woman, is becoming an increasingly important topic in modern society. This form of community reflects deep changes in social values, family perception and lifestyle choices. Instead of traditional marriage, common-law unions offer couples the freedom to live together, share life's contents and satisfy emotional, intimate and practical needs, without the formal obligation of marriage. When defining extramarital unions, it is crucial to point out that they do not have a legal basis, as is the case with marriage. Couples in such unions often opt for this form of partnership for flexibility and freedom, but it can lead to legal and emotional challenges in the event of a breakup. The social perspective on extramarital unions often varies; while some see these relationships as an alternative to traditional marriage, others consider them less stable and less binding. In the context of legal aspects, cohabitation is often not recognized in the same way as marriage. This can affect the property rights and obligations of the partners, as well as the protection of children who may be born from such relationships. The legal status of these communities may vary depending on the legislation of a particular society, which creates the need to adapt legal norms to adequately protect the rights of all involved parties. Compared to marriage, common-law unions often differ in their legal and social perception. Marriage is often formalized by a legal act and carries with it certain obligations and privileges that common-law unions may not have. However, both types of partnerships offer emotional support and stability to their members, given the specific circumstances and life choices of the couples.