Luther and Calvin provided us with wiggle room in that sola scriptura clause. They told us to tell them where they were wrong. Now you might ask Kolo why the Orthodox reject the Nicene Creed as written or the infalibility of the Pope (which I believe has a curse attached to it as well). Does that make him nervous?
Luther and Calvin are mere men, and they were still processing the Reformation of the Church. At the time they were more concerned with primary doctrines like justification and salvation.
The perpetual virginity is not necessary from the text, but it a while before the Reformation got around to it.
"Now you might ask Kolo why the Orthodox reject the Nicene Creed as written or the infalibility of the Pope (which I believe has a curse attached to it as well)."
We don't reject the Nicene Creed as written by the Ecumenical Councils.
"Does that make him nervous?"
Anathemas from Popes whom I don't believe are infallible? Nope, they don't make me nervous. Anathemas from Ecumenical Councils? Yup!