By C0-Blogger John-Mark Miravalle, S.T.D. Defenders of Humanae vitae have sometimes felt forced into a bit of a tightrope walk when it comes to the connection between sex and fertility. On the one hand, the document’s principle is straightforward enough: don’t separate what belongs together. It’s the principle invoked by Christ against divorce, and it covers plenty of other cases. It illuminates why we should avoid decapitation (separation of head and body), hypocrisy (separation of declared conviction...