Can you spot a good relationship? Of course, nobody knows what really goes on between any couple, but decades of scientific research into love, sex, and relationships have taught us that a number of behaviors can predict when a couple is on solid ground or headed for troubled waters. Good relationships don’t happen overnight. They take commitment, compromise, forgiveness, and most of all — effort. Keep reading for the latest in relationship science, fun quizzes, and helpful tips to help you build a stronger bond with your partner.