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...Where he falters, here, as I see it, is that while he accepts the overall Biblical/theological argument against the rejection/disabling of natural fertility, he can't quite see how this could apply to "every" act of sexual union. Bu that's the standard that applies to all other moral choices: they are judged on an "each act" and not an "overall" basis...
I would say that the connection of normal, natural sexual intercourse with the normal, natural pattern of fertility is part of God's design, our "Constitution." And (to borrow a familiar phrase) what God has joined together --- sex and fertility ---- no man should put asunder.

I'm curious, how does Catholic-approved NFP (natural family planning) fit into that over-all standard of yours?

It fits into that standard because at no point is an act of sexual union altered, turned away from its natural potential for life (whatever that potential may be), or disabled in any way.

In other words, there's only natural marital intercourse, ~OR~ periodic, very temporary and mutually-agreed abstinence --- which can, by the way, be used either to achieve or to space pregnancies. My husband and I used it to maximize our chance to conceived... and it worked :o)

God made female fertility cyclic. So understanding, respecting and harmonizing with that cyclic pattern means cooperating with --- not overriding or destroying --- the characteristics God has provided.

I treats fertility as a precious potential, not as a disease. As a feature, not a glitch.

I personally think God is so brilliant.