“Any other choice of cohabitation outside of a Church marriage is a perversion of the Law of God and is in clear contradiction to what the Church believes and what Christ teaches. The Church cannot justify cohabitation, despite the fact that modern “progressive” and godless society widely supports and even legalizes new types of cohabitation in order to justify sin and recognize it as a law and norm.”
(Metropolitan Timothy of Bosra in pravoslavie.ru)