Relating to participation in athletics according to biological sex.

Requires each athletic association, conference or organization with authority over intercollegiate sports, post-secondary institution of education and school district to designate athletic competitions and extracurricular sports according to biological sex. Prohibits biological males from participating in athletic competitions or extracurricular sports designated for biological females. Requires academic entities to designate bathrooms and locker rooms for exclusive use by either persons of the male biological sex or persons of the female biological sex. Except as provided under written policies for coaches, trainers and other authorized persons, prohibits persons of the male biological sex from entering or using bathrooms or locker rooms designated for use by, or in use by, persons of the female biological sex and prohibits persons of the female biological sex from entering or using bathrooms or locker rooms designated for use by, or in use by, persons of the male biological sex. Provides causes of action for students, post-secondary institutions of education and school districts.