Okla. Stat. tit. 21, § 21-871: Adultery defined - Who may institute prosecution

Adultery is the unlawful voluntary sexual intercourse of a

married person with one of the opposite sex; and when the crime is

between persons, only one of whom is married, both are guilty of

adultery. Prosecution for adultery can be commenced and carried on

against either of the parties to the crime only by his or her own

husband or wife as the case may be, or by the husband or wife of the

other party to the crime: Provided, that any person may make

complaint when persons are living together in open and notorious

adultery.