NB: I hardly need mention that I do not quote this because I agree with this statement. I have written extensively about how I disagree with Mahaney's views on the Song of Solomon - as well as a whole host of other Christian theologians including the Puritans. I quote it for a point of reference if anyone is any doubt about what Mahaney is actually teaching. A key point of context can be found when C J Mahaney says: "I'm no scholar" (p154).
"The Song of Solomon. It's about sex ... his "Song of Songs" is nothing less than an explicit and unblushing celebration of sex within marriage ... That's right gentlemen. Solomon's Song of Songs is an entire book of the Bible devoted to the promotion of sexual intimacy within the covenant of marriage. It's an eight chapter feast of unbridled, uninhibited joyous immersion in verbal and physical expressions of passion between a man and a woman ... Spiritualizing the Song of Solomon just doesn't make sense. What's worse, it denies to us the powerful impact that God intends for it to have on our marriage".
C J Mahaney - "Sex, Romance and the Glory of God: What Every Christian Husband Needs to Know" in "Sex and the Supremacy of Christ" - Piper, John and Taylor, Justin (editors) - Crossway Books (2005) - (pp151-152, 154).