University of Virginia sociologist Brad Wilcox has this article in the latest edition of Touchstone Magazine chronicling how sociological data keeps pouring in that confirms the truth (or at least the practical benefits) of the Church's sexual morality.
He ends the piece by noting the rise of enthusiasm for the arguments made by Pope Paul VI in Humanae Vitae among notable evangelicals such as Harold O.J. Brown and J.I. Packer. As Dave mentioned, it seems that Protestants are sometimes latching on to these truths quicker than many Catholics. And it does seem that when offered sound evidence, many evangelicals "convert" to more Catholic positions on any number of matters. Perhaps the term "orthodoxy" in vogue amoung traditionalist ecumenists will perhaps gain a morally robust component.