People have a social obligation to conform to the general rules of sleeping: sleep at night, in a bed, in a private place away from public view, and in proper attire.
Physicians make patients aware of those interventions that they (the patients) may then refuse. In short, informed consent is less about patient decisions than it is about restraining physicians.
Preventing bad outcomes for teens and their offspring was the impetus behind confidential care for reproductive health. Requiring parental involvement created an obstacle to the provision of necessary care.