John MacArthur has weighed in on the issue of pastors using graphic sexual language when preaching on the Song of Solomon. Said the Rev. Doctor MacArthur:
Apparently the shortest route to relevance in church ministry right now is for the pastor to talk about sex in garishly explicit terms during the Sunday morning service. If he can shock parishioners with crude words and sophomoric humor, so much the better. The defenders of this trend solemnly inform us that without such a strategy it is well-nigh impossible to connect with today's 'culture.' (In contemporary evangelicalism that term has become a convenient label for just about everything that is uncultured and uncouth.)
Sermons about sex have suddenly become a bigger fad in the evangelical world than the prayer of Jabez ever was. Everywhere, it seems, churches are featuring special series on the subject. Some of them advertise with suggestive billboards purposely designed to offend their communities' conservative sensibilities.
Quite a few pastors have earned widespread media coverage by issuing 'sex challenges' to church members. These are schemes that make daily sex obligatory for married couples over a specified time—usually between seven and forty days. (How people are made accountable for this is a question I'm afraid to raise.)
I would be the last to suggest that preachers should totally avoid the topic of sex. Scripture has quite a lot to say about the subject, starting with God's first words to Adam and Eve ('Be fruitful and multiply'—Genesis 1:22). God's law has numerous commands that govern sexual behavior, and the New Testament repeatedly reaffirms the Old Testament standard of sexual purity. Finally, in the closing chapters of Scripture we are told that sexually immoral people will be cast into the lake of fire (Revelation 21:8). So there's simply no way to preach the whole counsel of God without mentioning sex."
Online Source: Shepherd's Fellowship