The issue of birth control remains a concern in that it implies a value judgment on life to come that both limits and attracts us. It limits us, not only because life and its understanding are complex. This complexity is understood as a questioning that divides opinions and leaves the majority in a pure obscurantism. Life attracts us because, on the one hand, all its considerations and consequences must be elucidated in the sense that they touch human dignity. In the face of the socio-cultural change, the interpretation of life... that have led the world to the passage of the western civilization from modernity to postmodernity, from modern paradigms to postmodern paradigms, namely the New World Ethics. Man is turned to nature to understand it. This book is solely based on the problem of birth control in order to elaborate a sexual ethic of natural birth control based on man's freedom to perpetuate his existence and increase the quality of life, a morally permissible action stripped of all external influence.