The evolution of bioethics laws reflects, in part, the evolution of French society’s view of the nature of the human body. In recent years, debates have focused on the consequences, in terms of filiation, of the 2013 law opening marriage to same-sex couples. In this particular context, this contribution examines how the development of stem cell research is disturbing our view of the very concept of the ordering of the human body. This concept is indeed central because it allows us to put ethics and democratic praxis into perspective.