Start off each day with a prayer to G-d to save us from lust that day.
Once we have gotten up and said Modeh Ani, we should pray to G-d from the depths of our heart and say;
"Please G-d, relieve me from the bondage of self. Please save me today from the disease of lust, in my heart and in my mind".
Then commit and say;
"I commit myself to one more day of sexual purity, from now until __________ (say the next day)".
This reminds us that our sobriety is a gift only for today. Tomorrow will take care of itself.
Then surrender to G-d and say;
"I surrender to you G-d, today,
-my right to be sexually responsive at all (besides with my wife),
-my right to lust in any form,
-and any fantasies or lust images lingering in my mind".