The Greek word for lust in the New Testament is epithumeo, to set your heart upon, to long for, to crave after, to covet. It is the desire to possess, to own, to consume, without caring about the needs or feelings of any other human being, nor the will of God. Passion is not all that lust is about. Passion is a part of love. Lust is a form of passion that has been misdirected and twisted by the power of sin.
Christians are a people of love.
We know what love is. We strive to grow in love and share love. Love consists of many things, doesn't it- friendship, empathy, sympathy as well as passion. Lust bypasses everything else and moves directly to passion. They become another body to conquer.