Chapter 8 explores the ways culture shapes our social relationships. It discusses relational models theory, conditions for forming friendships, culture-specific and cross-cultural studies on friendship, physical attractiveness and beauty, cultural constructions, and culture-specific and cross-cultural studies on physical attractiveness and beauty. It addresses mate choice, love, Sternberg’s triangular theory of love, romantic love across cultures, and love and marriage. Finally, it examines the number of possible marriage partners, social practices for choosing a marriage partner, costs and benefits of marriage, intercultural weddings, migration and marriage, culture-specific studies on marriage and cultural change, marital happiness, and child marriages. This chapter includes a case study, Culture Across Disciplines box, chapter summary, key terms, a What Do Other Disciplines Do? section, thought-provoking questions, and class and experiential activities.