Tim Challies recently wrote a series titled Sexual Detox. This is something that is all too often ignored within the church. I urge you to read this to get Biblical knowledge on how to purify the marriage bed.
Sexual Detox I: Pornifying the Marriage Bed
Sexual Detox II: Breaking Free
Sexual Detox III: A Theology of Sex
Sexual Detox IV: Detoxification
Sexual Detox V: Freedom
I was also pleased to see that Aileen, Tim's wife, wrote a 3 part series to women about sex and the false messages associated with it.
False Messages I: What He Really Wants
False Messages II: The Heart of Rejection
False Messages III: Desiring Him