What's IGNORant is to IGNORe that a whole layered, mutually supporting set of natural behaviors embedded within our physiological, reproductive, immune systems, etc (...all which work in marvelously complementary ways) are merely incidental to God's plan for marriage!

Oh..all that...it's just conceptual and incidental! 

That a woman's immune system doesn't immediately kill sperm - during her fertile period - should tell you that complementarity isn't merely "conceptual"!!!