"Your relationship is going great - it's not quite at the marriage mark, but he's certainly looking like a keeper. No better time to start living together, right? Well, as omnipresent as such a milestone has become, moving in with your guy isn't always as easy as it may look or sound. Enter Shacking Up: The Smart Girl's Guide to Living in Sin Without Getting Burned, by Shape contributing writer Stacy Whitman, and her sister, attorney Wynne Whitman. "From disapproving parents to toilet-seat wars, lots of problems can crop up when you live together," says Stacy Whitman, who knows from personal experience (she's happily married now). "We wrote this book to help women avoid the pitfalls and up their chances of having a happy ending." Whether you're not quite sure if you're ready to make the sharing-your-love-nest leap or if you've already merged households and need help on financial, emotional or even legal issues, the Whitman sisters guide you through it all with a healthy and humorous edge."