This is by far the single most helpful book on sexual purity for men that I’m aware of:

Heath Lambert. Finally Free: Fighting for Purity with the Power of Grace. Grand Rapids: Zondervan, 2013. 176 pp. 23-page sample PDF.

It’s clear, direct, practical, and grace-giving.

I highly recommended this for men who are fighting lust or wallowing in it. I pray that God will use this book to help thousands of men be “finally free.”

The top three resources I know of on how to fight sexual sin are …

1. Heath Lambert’s book
2. John Piper’s chapter (see below)
3. Joe Rigney’s MP3s (see below)

Be sure to read Piper’s chapter together with Lambert’s book. They have some different strengths that complement each other.

Other Resources on Sexual Purity

1. Porn, Pride, and Praise: An Interview with Heath Lambert (22 Minutes)
2. CBMW interview with Heath Lambert
3. John Piper, “Faith in Future Grace vs. Lust,” in Future Grace (Sisters, OR: Multnomah, 1995), 329–38.
4. Joe Rigney: “Fighting the Good Fight: Gospel Strategies in the Fight Against Sexual Sin” (PDF Handout). 4 MP3s:
   1. Walking by the Spirit
   2. Learning to be a Man Again
   3. Thinking Rightly about the War
   4. Words for Men at All Stages
5. Twelve Reasons to Give Up Porn
6. Accountability
7. The Stain That Stays
8. Covenant Eyes
9. Purity is always smart; impurity is always stupid
10. Help for Fighting Lust: A Meditation Plan
11. How Addiction Works
12. Internet Pornography: The God of Truth and the Lies of Porn

Update: “Your Body Is a Temple” is a sermon on 1 Corinthians 6:19–20 that I preached to Bethlehem College & Seminary on 9/18/2015: