Slight penetration is sufficient to complete crime

21 O.S. § 1113, under Crimes and Punishments.

21 O.S. § 1113

The essential guilt of rape or rape by instrumentation, except with the consent of a male or female over fourteen (14) years of age, consists in the outrage to the person and feelings of the victim. Any sexual penetration, however slight, is sufficient to complete the crime. R.L.1910, § 2416; Laws 1981, c. 325, § 4.