Ohio Rev. Code Ann. § 3911.19

No life insurance company doing business in this state shall make or permit any distinction or discrimination in favor of individuals between any insured persons of the same class and equal expectation of life in the amount or payment of premiums, or in rates charged for policies of life or endowment insurance, or in the dividends or other benefits payable thereon, or in any other of the terms and conditions of the contracts it makes. No such company, or any agent thereof, shall make any contract of insurance, or agreement as to such contract, other than one that is plainly expressed in the policy issued thereon.