Sex and administrative law are not words that are traditionally uttered in the saine breath. Yet, recently, administrative law scholars and courts have increasingly focused on precisely this relationship. The past decade has seen a transformation of the way sex discrimination, sexual violence, sexual harassment, and just plain sex is legally regulated in the United States. Increasingly, administrative agencies are defining what sex is permissible, requiring educational institutions to adopt particular policies on sex, and specifying how sex that deviates from those norms is investigated and adjudicated. Today, sex is a domain of the federal bureaucracy. The question is what role traditional administrative law principles will play in the administration of sex.