Tex. Labor Code § 21.119

If disability, religion, sex, national origin, or age is a bona fide occupational qualification reasonably necessary to the normal operation of the particular business or enterprise, performing any of the following practices on the basis of disability, religion, sex, national origin, or age of an employee, member, or other individual is not an unlawful employment practice:

(1) an employer hiring and employing an employee;

(2) an employment agency classifying or referring an individual for employment;

(3) a labor organization classifying its members or classifying or referring an individual for employment; or

(4) an employer, labor organization, or joint labor-management committee controlling an apprenticeship, on-the-job training, or other training or retraining program admitting or employing an individual in its program.