If you're thinking about improving your relationship by the book – that is, using a self-help guide to improve your love life, there are a few tried-and-true choices and some books that are timely and smart. Here are a few choices that can heat things up and even help heal a broken heart to help you move on. Let's start with the sexy stuff -- Mating in Captivity by Esther Perel, a sex and marriage and family therapist, seeks to help long-term couples, heterosexual and gay, with kids and without, of all ages to rediscover the passion and intimacy in their relationships. She reveals what's missing in relationships outside the bedroom when what happens in bed suffers. Her steamy tips are sure to help any relationship that needs to regain that spark. Love in the Time of Algorithms is a contemporary take on how to meet people online. Author Dan Slater investigates how online dating and the numerous online dating sites have affected how we couple up. He examines how it all began in 1965 when called "computer dating" to today's multi-million-dollar industry in which one size does not fit all when it comes to dating sites.