to marry.” To decided Hargrave case, the OK Supreme Court cited Brooks, and earlier case decided by the very court: “To constitute a valid ‘common-law marriage,’ it is necessary that there should be an actual and mutual agreement to enter into a matrimonial relation, permanent and exclusive of all others, beween parties capable in law of making such contract, consumated by their cohabitation as man and wife. A merely promise of future marriage, followed by illicit relations, is not, in itself, sufficient