Mutual attachments enabled group survival for our ancestors. Child"s survival chances boosted by two bonded parents. Satisfy the need to belong in balance with autonomy and competence and the typical result is a deep sense of well being. People, especially women, respond to ostracism with depressed mood, anxiety, hurt feelings, efforts to restore relationships and eventual withdrawal. The social pain of ostracism (excluding or ignoring others) increases aggression. People remember and relive past social pain more easily than past physical pain. Factors that nurture liking and loving: proximity, physical attractiveness, similarity, feeling liked. Proximity can breed hostility but more often kindles liking. Interaction enables people to explore their similarities, to sense one another"s liking, and to perceive themselves as a social unit. Merely anticipating interaction and expecting to date someone boosts liking. Adaptive phenomenon; anticipatory liking increases the chance of a rewarding relation.