Other forms: lecheries
Lechery is a noun applied to a person's feelings that are lustful or sexual in an extreme or unnatural way. A person's lechery may lead to wrong and unlawful physical acts or attacks on others, or to the making and viewing of inappropriate pictures and movies.
Someone described as a "pervert" might also be called a lecher, whose offensive behavior and actions are lechery. Attraction between a husband and wife would not be lechery, because it's between two people who have a desire together. Lechery is a one-sided lust that crosses the line to being inappropriate and making others feel very uncomfortable or even afraid. Bad guys or "Casanovas" in literature demonstrate lechery when they try to win over innocent young women with lies.