If you've ever been trapped in a conversation with someone with whom you weren't interested, you'll understand how uncomfortable it can be. Imagine this happening to you several times a day, almost every day, for many years. Wouldn't you recognize the need to shut those people down before they even got started? Over time, as a woman interacts with ever more nice guys, she begins to evolve simple-yet-effective strategies for countering this barrage of bore. Collectively, these strategies make up what is metaphorically called her protection shield.