Steve Harvey's overarching principle for women to achieve fulfillment and success in their romantic relationships is encapsulated in his concept of "Act Like a Lady, Think Like a Man." This principle emphasizes the importance of understanding male perspectives and behavior in relationships, empowering women to take control of their love lives by adopting strategies typically associated with masculinity, such as assertiveness, self-respect, and setting clear boundaries. Harvey encourages women to prioritize their own happiness, self-worth, and standards while navigating the complexities of romantic relationships.