41 C.F.R. § 60-20.2 Recruitment and advertisement.
Title 41 - Public Contracts and Property Management
(a) Employers engaged in recruiting activity must recruit employees of both sexes for all jobs unless sex is a bona fide occupation qualification. (b) Advertisement in newspapers and other media for employment must not express a sex preference unless sex is a bona fide occupational qualification for the job. The placement of an advertisement in columns headed “Male” or “Female” will be considered an expression of a preference, limitation, specification, or discrimination based on sex.
Title 41: Public Contracts and Property Management
PART 60–20—SEX DISCRIMINATION GUIDELINES
§ 60-20.2 Recruitment and advertisement.

