I never read Tim's book on marriage. What was it that you disliked about it, if you don't mind my asking?
The Clifford and Joyce Penner book, "The Gift of Sex" is a far better one for a Christian perspective on marital sex. Ed Wheat has written a few good books on the subject, as has Howard Hendricks, and a number of other Christian authors. Tommy Nelson's "The Book of Romance" is also excellent.
Being a middle-aged single Christian man who will not have sex outside of marriage, I have been pleasantly surprised at the number of middle-aged single Christian women who look forward to a passionate and uninhibited sex life with a future husband.