The difference between the two Christian churches was the Eastern Orthodox Church did not add too, subtract from, or alter any of the original teachings and beliefs of the original faith of Christ and the apostles to this day.
There is nowhere in Scripture where it states a man and a woman in the sacramental life of marriage can not participate in the expression of love with one another as in conjugal relations.
What distinguishes it from other Christian faiths is from the point of its inception; it makes the claim that it has not added, altered, or subtracted from any part of the original teachings of its founder Christ and the Apostles.
As the church grew, the bishops found it difficult to serve a large number of parishes, and as a result, they began to appoint a presbyter (priest) for each congregation who acted as his delegate.