Here are the books I gave away today, dealing with various topics covered by the sixth and seventh commandments ("You shall not murder" and "You shall not commit adultery"). In the sermon I quoted from Rosaria Butterfield's Openness Unhindered: Further Thoughts of an Unlikely Convert on Sexual Identity and Union with Christ. 

Ken Sande and Kevin Johnson, Resolving Everyday Conflict. A shorter version of Sande's excellent Peacemaker, about forgiveness and conflict resolution.

Timothy and Kathy Keller, The Meaning of Marriage. About marriage in general. 

David Powlison, Making All Things New: Restoring Joy to the Sexually Broken. A fairly broad book about sexual sin and restoration from it; written for both men and women. 

Harvest USA, Alive: Gospel Sexuality for Students. A frank discussion guide for teens; this would be good for parents to use for discussion with their kids. Covers various sin struggles as well as singleness, dating, and marriage. 

Heath Lambert, Finally Free: Fighting for Purity with the Power of Grace. About how God graciously enables us to overcome pornography use. Applicable to both men and women, though there is a (very helpful) appendix written for family and friends of men who use porn. 

Kevin DeYoung, What Does the Bible Really Teach about Homosexuality? Covers the main biblical passages on homosexuality, and then works through common objections (e.g., "The Bible Hardly Ever Mentions Homosexuality"; "It's Not Fair"; "The God I Worship is a God of Love").

Vaughan Roberts, Transgender. A brief look at what the Bible says about transgenderism. While this book is very well-done, I wouldn't recommend all the books that Roberts does (e.g., books by Mark Yarhouse).