Okla. Stat. tit. 25 § 1306
It is a discriminatory practice for an employer, labor organization, or employment agency to print or publish or cause to be printed or published a notice or advertisement relating to employment by the employer or membership in or a classification or referral for employment by the labor organization, or relating to a classification or referral for employment by the employment agency, indicating a preference, limitation, specification, or discrimination, based on race, color, religion, sex, national origin, age, genetic information or disability, unless the employer, organization or agency can demonstrate that accommodation for the disability would impose an undue hardship on the operation of the business of such employer, organization or agency; but a notice or advertisement may indicate a preference, limitation, specification, or discrimination based on religion, sex, or national origin when religion, sex, or national origin is a bona fide occupational qualification for employment.
Okla. Stat. tit. 25, § 1306