Ok, it really is important to understand, and no, not because I want you to choose the EO, but because I see this understanding here often - “The EO don´t have a rule for XYZ, so they are not clear in it, they are too soft…etc”.
Yes we don´t have a document for all orthodox churches about birth control, but we have soo many priests, documents, etc talking about.
The personal contact is in our tradition still far more important - and morally bounding - than an official paper. When I visist the orthros at my parish, we sit all together and eat afterwards and we do talk about such themes, as well as we have to confess our sins - and we are asked to confess sexual sins, too. Does this lead to false decisions? Sometimes, maybe. Does unpersonal dogmaticism lead to false decisions? Sometimes, maybe. We have different ways to deal with moral guidance.
The EO have a differnet understanding of marriage, because we believe in the mysterion, not the actual legal defined sacrality as existent in the meaning of the latin sacramentum. For further information, read more about this, because it´s fundamental. Many differneces start here.
Having no general setted in stone rule doesn´t mean we are free to chose what we like morally.