This is a much-needed development from the first edition that provides an update on the theory and research on love by world-renowned scientific experts. It explores love from a diverse range of standpoints: social-psychological, evolutionary, neuropsychological, clinical, cultural, and even political. It considers questions such as: how men and women differ in their love, what makes us susceptible to jealousy and envy in relationships, how love differs across various cultures? As the neuropsychological basis of love is examined, this study showcases what attracts people to one another, why love has developed the way it has over time, and what evolutionary purpose it serves. It also analyses why and when love relationships both succeed and fail, which means readers will be rewarded with a better understanding of their own relationships and those of others, as well as what can be done to build a lasting, loving relationship.