AZ HB2391

Defines biological sex as determined at birth (male or female) based on reproductive system development and applies this definition to all state laws and rules.

Establishes that terms like "woman," "girl," "man," "boy," "mother," and "father" refer specifically to biological sex categories.

Clarifies that equal treatment does not require identical treatment and that separate accommodations based on sex are not inherently unequal.

Subjects sex-based legal distinctions to intermediate constitutional scrutiny and deems sex-separated spaces in athletics, prisons, shelters, restrooms, and similar facilities substantially related to government objectives of health, safety, and privacy.

Requires school districts, public schools, and state agencies collecting vital statistics for antidiscrimination compliance or data gathering purposes to identify individuals as male or female at birth.