Healing the Wounds of Sexual Addiction
Probably the most thorough Christian book on the causes of and recovery from sexual addiction. While this book is often used in recovery groups and counseling, it was written primarily to leaders who oversee people who struggle with sexual addiction.

The Pornography Trap

by Mark Laaser & Ralph Earle

Men everywhere are living in bondage to Internet pornography and fear of exposure. If you are flirting with this devastating addiction, or if you're counseling others who have already crossed the line, Ralph Earle and Mark Laaser help you understand the core issues related to sexual sin and give insight into developing a biblical view of healthy sexuality. Especially written for pastors and Christian leaders.

The Social Costs of Pornography: A Collection of Papers
by The Witherspoon Institute

This collection of papers attempts to document, analyze, and explain the social costs of pornography, building the case that citizens need to revisit this issue and look squarely at a problem many would rather ignore.