It's wrong to be dishonest.
David is an unhappily married man and is attracted to a woman named Karen.
David wants to be intimate with Karen.
David talks to his wife, where they mutually decide to divorce, and he starts a relationship with Karen once single.
David becomes very friendly with Karen, telling her he is single, and they begin a sexual relationship.
Karen and David fall in love, later marrying and have a very fulfilling and satisfying life together.
Karen finds David's wedding ring hidden in his car, tells his wife, and David's wife divorces him for his infidelity.