And The #1 Reason Why Christians Don't Succeed In Staying Pure Before Marriage Is Because...

They don't want to.

It's as simple as that. 

Staying pure so that you can experience "The Sexual Force Unleashed" and "Romantic World Peace" within a Christ-centered marriage requires discipline, hard work, and focus.  It's very similar to studying the martial arts in that it's a LIFELONG process.  Just like you have to practice DAILY to develop your ability to defend yourself from a physical attack, you also have to practice DAILY to develop your ability to defend your V-card and your marriage from attacks by forbidden sexual temptations.  When many Christians realize the sacrifices that they will have to make to live a life of purity, they decide that it's more trouble than it's worth and they give up.   Unfortunately, this leaves them completely defenseless when they are actually attacked.  A martial artist who experiences an attack which they did not prepare for normally winds up seriously injured or dead.  Likewise, a Christian who does not prepare for the violent attacks of forbidden desires will wind up with a sexuality that is either seriously injured or dead.

On top of that, many Christians know that forbidden sex is wrong, but want to experience it anyway because it seems fun.  These are the Christians who claim that they can "play" without "going all the way."  They are the spiritual equivalents of martial artists who know that they shouldn't hang out in bars/nightclubs or go out alone on car dates with strangers, but choose to do it anyway because it's fun.  These Christians believe that, like their black belt counterparts, they can "handle it" if things get out of hand.  Unfortunately, like the guy who winds up getting jumped by 20 bikers because he said the wrong thing about their leader's mother, or the girl who gets pinned to the backseat of her date's car because she got hammered with the wrong person, these Christians wind up in over their head.  Sometimes, they escape with their V-cards intact and their future marriages unscathed.  Most of the time, they don't.

In all likelihood, these Christians wanted to "fail" all along and deliberately stacked the deck against themselves so that they would have an excuse to sin.  That way, they can enjoy the forbidden pleasure of their sin and deny responsibility for their actions by blaming the heartless, evil, conniving player/playeress who "seduced them" (and leave out the fact that they secretly desired that person all along).  It's only when the consequences of their actions (like STDs and baby momma drama) come after them like a gang of biker thugs or a drunk date who's interested in nonconsensual love that these Christians express regret for what they did.  And even then, those consequences aren't always enough to keep them from doing it again.

If you truly love Christ, you will obey His commandments about romance and sex and stay pure before, during, and after marriage.  Like a wise martial artist, not only will you properly train to defend yourself from the forbidden temptations which want to kill you.  You will also save yourself a lot of pain and suffering by avoiding dangerous situations to begin with.  If you do these things, not only will you experience the power of human fusion by truly becoming one with your spouse.  God will also allow you to lead others to saving faith in Jesus through the sacred starlight of your Christ-centered marriage.  

 John 14: 15 "If you love me, keep my commands." (NIV)