NFP? Uh huh…We tried that with our first three children. Don’t get me wrong, I love them dearly and wouldn’t wish it any other way but all of them were conceived during “infertile” periods. We were practically tearing each others hair out reviewing everything for mistakes but there were none. I have become skeptical at very best of NFP and “infertile” times.
My wife is actually Orthodox, but far more liberal and “progressive” minded than myself.
And it is not a sin? Hrm, I remember being berated by a Catholic priest (relative of hers) for not giving into her “demands” often enough

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That’s right, I’m exercising my will to not leave my children without a mother. How dare I.