C. J. Mahaney speaks on Song of Solomon ... believe me, the point is not that Christ is in between the Old and New Testament!
under the sub-heading "Building Strong Families in Your Church"
(scroll down to the sermon "Sexual Intimacy in Marriage" by C. J. Mahaney)
He quotes Tom Gledhill's commentary:
"This unabashed reveling in creatureliness must not be cramped by thoughts that it is all somehow beneath our dignity and that we would be better praying than making love. For this is a false dichotomy that must be banished forever. We do not need to sanctify an entirely natural act by having simultaneous spiritual thoughts in our spouses arms."
In addition, I have REALLY enjoyed listening to Mark Driscoll's sermons on Song of Solomon.
type in Song of Songs in the "search" box
click on the middle option for the audio options