Okla. Stat. tit. 21, § 885
Persons who, being within the degrees of consanguinity within which marriages are by the laws of the state declared incestuous and void, intermarry with each other, or commit adultery or fornication with each other, shall be guilty of a felony punishable by imprisonment in the State Penitentiary not exceeding ten (10) years.
R.L. 1910, § 2443; Amended by Laws 1997, HB 1213, c. 133, § 262 (effective date amended to July 1, 1999, by Laws 1998, 1st Extr. Sess., HB 1002, c. 2, §§ 23-26, emerg. eff. June 19, 1998) (superseded document available); Amended by Laws 1999, 1st Extr. Sess., HB 1009, § 166, emerg. eff. July 1, 1999 (superseded document available).