Okla. Stat. tit. 43, § 43-129: Alimony without divorce

The wife or husband may obtain alimony from the other without a

divorce, in an action brought for that purpose in the district

court, for any of the causes for which a divorce may be granted.

Either may make the same defense to such action as he might to an

action for divorce, and may, for sufficient cause, obtain a divorce

from the other in such action.