Never that I know of. The Catholic Church in the West did for a while ordain already-married men, but:
1. Even when common, this practice was never considered normative.
2. There's much evidence that after ordination married clergy lived with their spouses as brother and sister, forgoing sexual relations.
3. The "change" that you mention in the early part of the second millennium was merely the legal codification of a near-universal (in the West) discipline of celibacy that had already been recognised as normative for centuries.