Before we can ask whether there is anything morally wrong with lust we have to know what we are talking about. What is lust? Here is a start:
The inordinate craving for, or indulgence in, the carnal pleasure which is experienced in the human organs of generation.
But this won't do as it stands since it mixes desire and satisfaction in the same definition. It also fails to distinguish between lust as an occurrent state and lust as a disposition or propensity. Suppose we distinguish: