Kentucky Revised Statutes Title XXXV. Domestic Relations § 402.020.Other prohibited marriages

(a) With a person who has been adjudged mentally disabled by a court of competent jurisdiction;

(b) Where there is a husband or wife living, from whom the person marrying has not been divorced;

(c) When not solemnized or contracted in the presence of an authorized person or society;

(d) Between members of the same sex;

(e) Between more than two (2) persons; and

(f) Except as provided in KRS 402.210, with a person who at the time of marriage is under eighteen (18) years of age.