Here are some posts I have been collecting on sexual purity:

F.L.E.E. – A Strategy for Purity – Trent Hunter (GC)
What’s your plan for the next encounter with temptation? Or for the next conversation with a friend, child, or spouse who needs your counsel?  Here’s a strategy: F.L.E.E.  It’s biblical, it’s hard to forget, and it fits on a napkin.

How Far Is Too Far: Part One, Part Two, Part Three – Crossway
Adapted from Sex, Dating, and Relationships by Gerald Hiestand and Jay Thomas
Very interesting and helpful approach.  Tim Challies offers another summary.

Sex As A Commitment Apparatus – Tim Keller via Kevin DeYoung
The Bible does not counsel sexual abstinence before marriage because it has such a low view of sex but because it has such a lofty one. The Biblical view implies that sex outside of marriage is not just morally wrong but also personally harmful. If sex is designed to be part of making a covenant and experiencing that covenant’s renewal, then we should think of sex as an emotional “commitment apparatus.”