The fact that we can respond in such totally opposite ways indicates that something different is going on inside of us in the two situations. What I am saying is that our battle with lust depends to a great extent on how we respond when temptation first hits, and that something inside of us helps guide that first response. This is where I believe having either a grateful or an ungrateful heart has its impact. The names of the two voices are pride and self-pity. They are the antithesis of a grateful heart.
Pride exalts the self.
Pride tells me I deserve good things. Pride tells me I have earned good things. Pride tells me that I am the real judge of what is good for me. Sexual pleasure is a good thing. I deserve some sexual pleasure.