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  An even-handed policy that prohibits to both sexes a style more often adopted by members of one sex does not constitute prohibited sex discrimination. This is because this type of regulation has at most a negligible effect on employment opportunity. It does not regulate on the basis of any immutable characteristic of the employees involved. It concerns a matter of relatively low importance in terms of the constitutional interests protected by the Fourteenth Amendment and Title VII, rather than involving fundamental rights such as the right to have children or to marry. Willingham v. Macon Telegraph Publishing Co., supra, 507 ...