Everyone wants to know the secret to getting and staying married. Research shows that married people are healthier than their single or divorced peers and that they tend to make more money and to report being far happier. But how to get there? In this special edition of TIME, we reveal:The new research on attraction and desire: what stokes it and what whittles it awayThe latest science on how a secure attachment to a spouse can measurably change your brain and protect your body from stressGreat advice from literature on love and commitmentWhat a healthy sex life looks likeThe one trait every marriage needsMoney moves every couple should makeWhy the divorce rate is at a 30-year low