The Supreme Court has held that a municipal ordinance construed to forbid sex-designated classified advertising column headings does not violate newspaper publisher's first amendment rights.
Pittsburgh Press Co. v. Pittsburgh Commission on Human Relations, 413 U.S. 376 (1973).
Ellen E. Katz,
Constitutional Law - Freedom of Speech - Commercial Speech Doctrine - Use of Sex-Designated Classified Advertising Column Headings,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol12/iss4/15