: Declining late-notice Saturday night dates (usually if not asked by Wednesday) to show she has a busy, fulfilling life.

The book’s central premise is that men are biologically driven to "hunt" and value what is difficult to obtain. To build attraction and secure a commitment, the authors argue a woman should be "easy to be with but hard to get". By following these rules, a woman—referred to as a "Rules Girl"—positions herself as a high-value prize. Key Principles and Guidelines