When it comes to lust, I don't have willpower. I am powerless. That is Step One. I admit I am powerless over lust. It is one of those all-in or all-out propositions for me. "Powerless" means I don't have any power. I can't exercise my willpower against lust, because I am powerless over lust.

So the power that frees me from the bondage of lust comes from One who has all power: God. And I connect to that power through a process of submitting to His will for me in the moments of life. I learned how to do that by working the 12 Steps of SA under the direction of a sponsor and through my daily/ongoing working of the "maintenance" steps of this program. 

The Big Book of Alcoholics Anonymous reminds me:
"Every day is a day when we must carry the vision of God's will into all of our activities. 'How can I best serve Thee--Thy will (not mine) be done.' These are thoughts which must go with us constantly. We can exercise our will power along this line all we wish. It is the proper use of the will." (page 85)

But if today, I instead choose to go back and rely on my own willpower over lust, if I refuse to surrender my will and life to Him, if I purposefully put myself into situations of sexual temptation, I can expect to be back on my own, relying on my own strength, something that I have proven over and over again that I can't do if I want to live free from the bondage of lust. And the bondage of lust always leads to my sexual acting out.

I've given up relying on my own willpower when it comes to lust. And I've also given up on running my own life and making decisions that will inevitably lead to acting out.