Okla. Stat. tit. 25, § 25-1311: Male and female employees

Notwithstanding any other provision of this chapter, it shall

not be an unlawful employment practice because of sex to

differentiate in employment, compensation, terms, conditions or

privileges of employment between male and female employees if such

differences are otherwise required or permitted by the laws of this

state, or by the provisions of Section 703 of the Federal Civil

Rights Act of 1964, as amended, or by the provisions of Section 6(d)

of the Federal Fair Labor Standards Act of 1938, as amended; nor

shall it be an unlawful employment practice because of sex for an

employer, pursuant to a plan, to provide differences in annuity,

death and survivors' benefits between widows and widowers of

employees.