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. Their feelings don't matter. Their future doesn't matter, as long as you get what you want. In the long run this breaks down community and leaves us feeling isolated and alone. Pornography feeds into lust.