The paper aims to explain the doubts connected with bigamy. It contains the views on the institution of family, the value of marriage, the descent of a child and the consequences related to them. The authoress starts the considerations with historical issues including the development of monogamous family and moves on to the regulations concerning bigamy throughout history. The paper also includes a detailed analysis of the crime from the article 206 of the Penal Code of 1997 penalizing bigamy and explains the doubts connected with this regulation. The final part of the paper demonstrates the circumstances supporting decriminalization of bigamy considering moral, emotional, psychological, normative and preventive factors.