The definition of Lust is strong sexual desire. The minimum requirement of the Lust epidemic is the need to have sex with someone new at least once a week. It can be difficult to determine the difference between a healthy sexual appetite and an addiction, but there are some key signs to look out for. If you find yourself thinking about sex more often than not, or if you're struggling to control your behavior, then it's possible that you have a problem with Lust.