The law 20 May 2016 marks the definitive overcoming of the traditional concept of family based solely on the union between a man and a woman and, consequently, the recognition of several family models, also deserving of protection. Jurisprudence had, both at European and national level, highlighted the problems of the lack of effective discipline for same-sex couples who actually shared part of their existence, without being able to boast rights or rights. duties in their personal relationships. This has ushered in the troubled legislative process of Act 76, the most significant steps that have led to the approval of the final text. With regard to discipline, the affinities and differences of the new institution of civil unions are highlighted with respect to the traditional one of marriage, of which the contents and purposes are essentially traced. Particular attention is paid to the failure to anticipate the obligation of fidelity and the prohibition of adoption