Unless prohibited by its articles of incorporation, a domestic stock or domestic mutual insurer may issue any, or all, of its policies with, or without, participation in profits, savings, or unabsorbed portions of premiums, may classify policies issued on a participating and nonparticipating basis, and may determine the right to participate and the extent of participation of any class, or classes, of policies. Any such classification or determination shall be reasonable and shall not unfairly discriminate as between policyholders within the same such classifications. A life insurer may issue both participating and nonparticipating policies only if the right or absence of right to participate is reasonably related to the premium charged.