María Antonieta MAGALLÓN GÓMEZ ^*

The author studies the propo-sed "living together society law" dated april 26th 2001, introduced by the Federal District II Legislative Assembly. The arti-cle begins with a sociological and teologi-cal explanation of the different sexual relations that take place between human beings. It analyses the legal nature, prin-ciples, sources and consequences of a fa-mily and for the living together society. Also reviews the differences between the family as an institution and the new figure of the living together society. Further, de-tails the legal categories in which each one belongs. Finally, it gives arguments sustai-ning that the living together society does not have the required elements to be con-sider as an institution, concluding that the proposed law should not be adopted by congress legislation.