Eastern Orthodox Church

Orthodoxy also teaches specific moral principles in marriage.

An excerpt from the article 18 facts about Eastern Orthodox Church
The relationship between spouses is to be guided by virtue of chastity, the basis of which is love, which consists of skillfully combining human passion with the gift of piety. According to Orthodox doctrine, sexual intercourse between spouses is an expression of faithful love vowed in the sacrament of marriage, and procreation is not a necessary but only one of many goals of marital life. The union of the spouses is paramount.