Actually, there are probably a lot of bad things about lust. But the following, according to one practical book, is one:
Lust treats people like football players treat a football in a ball game. How does a running back treat a football?
He cradles it; he cuddles it; he risks life and limb to take that ball to the goal line. But once that football crosses the goal line and he scores a touchdown, what does he do? He will spike it. He'll pound it to the ground; he'll dance around proclaim his conquest. Finally, when the game is over, he will ignore it.
The purpose has been served. It has simply been an object to accomplish a goal. If you have been the object of someone's lust, you know how demeaning it feels.
Make no mistake; it is the lust in the heart that drives one to dehumanize people. Maybe that is one reason Jesus said, “You have heard the commandment that says, ‘You must not commit adultery.’ But I say, anyone who even looks at a woman with lust has already committed adultery with her in his heart (Mt. 5:27-28.) NLT
Source: THE 7 SINS OF HIGHLY DEFECTIVE PEOPLE by Rick Ezell