Here is a very thought-provoking read from Micheal Liccione on his view of the continuity between the old contractual and the new covenantal view on marriage, visited on the occasion of recent news-making statements of Theology of the Body advocates.
This topic is one of the central salients in spiritual combat, as priests who hear the confessions of males know all too well. Its also being the most widely discussed is not altogether unreasonable from any standpoint. If only because of the effects of original sin, the deadly sin of lust is common and even manifests itself in marriages. Like any other deadly sin, lust is incompatible with the love of God and neighbor, even if the neighbor happens to be one's spouse. It doesn't even take faith to know that the line between lust and healthy sexual desire is quite porous. So the notion that one should strive to be both good in bed and an orthodox Catholic seems ludicrous to unbelievers and disaffected Catholics as well as to many traditional believers.