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What is the topic of this paragraph?
Marriage customs vary widely, but the universality of some form of marriage throughout history and around the world suggests that it meets fundamental needs. In most societies, marriage is considered the best way to ensure the orderly raising of children. It allows for a decision of labor within a consuming and working unit. Ideally, it offers intimacy, commitment, friendship, affection, sexual fulfillment, companionship and an opportunity for emotional growth, as well as new sources of identity and self-esteem.
What is marriage.