From their site, 
XII. 3. Among the problems which need a religious and moral assessment is that of contraception. Some contraceptives have an abortive effect, interrupting artificially the life of the embryo on the very first stages of his life. Therefore, the same judgements are applicable to the use of them as to abortion. But other means, which do not involve interrupting an already conceived life, cannot be equated with abortion in the least. In defining their attitude to the non-abortive contraceptives, Christian spouses should remember that human reproduction is one of the principal purposes of the divinely established marital union (see, X. 4). The deliberate refusal of childbirth on egoistic grounds devalues marriage and is a definite sin.
At the same time, spouses are responsible before God for the comprehensive upbringing of their children. One of the ways to be responsible for their birth is to restrain themselves from sexual relations for a time. However, Christian spouses should remember the words of St. Paul addressed to them: «Defraud ye not one the other, except it be with consent for a time, that ye may give yourselves to fasting and prayer; and come together again, that Satan tempt you not for your incontinency» (1 Cor. 7:5). Clearly, spouses should make such decisions mutually on the counsel of their spiritual father. The latter should take into account, with pastoral prudence, the concrete living conditions of the couple, their age, health, degree of spiritual maturity and many other circumstances. In doing so, he should distinguish those who can hold the high demands of continence from those to whom it is not given (Mt. 19:11), taking care above all of the preservation and consolidation of the family.
The Holy Synod of the Russian Orthodox Church in its Decision of December 28, 1998, instructed the clergy serving as spiritual guides that «it is inadmissible to coerce or induce the flock to… refuse conjugal relations in marriage». It also reminded the pastors of the need «to show special chastity and special pastoral prudence in discussing with the flock the questions involved in particular aspects of their family life».