Hi Patriarch Noah I,
I am not a clergyman or theologian, so I might be way off-base, but from what I read, I do not believe that there exists one single Orthodox view on sex and sexuality. Of course, all forms of sexual lust - when one person savors sexual pleasure and uses other persons merely to satisfy his/her bodily needs - is condemned. Intimate relationships between a man and a woman are possible only in marriage, which the Church sees not as a venue to satisfy one's bodily needs but as a lifelong commitment and, morever, a form of martyrdom (self-sacrificial witnessing of the Christian Truth, complete giving of one's self to aid the other partner's theosis).
As for whether sex in marriage, per se, is a holy thing or a "bestial" thing, opinions differ. St. Gregory of Nyssa used to theorize a lot about pre-lapsarian humans having a "thin," etherial flesh and not having any sexual desires as we now know them. He believed that the commandment to Adam and Eve to be "fruitful and multiply" did not actually mean the commandment to beget children the way we do it now. He viewed sex as something always bestial, even in marriage, something that we acquired against God's will as a result of our lapse into sin. On the other hand, St. John Chrysostom ridiculed and criticized some older women from his congregation for their fancied notion that if they abstain from any sex with their husbands, they thus become holier. In present-day Orthodox catechisms, particularly in Clark Carlton's (the one I personally used when I was a catechumen), marital sex is viewed very positively, and there is a very strong emphasis that it is not merely a means of procreation.
I hope other people who are more knowledgeable will give you a more thorough response and references.