What is "non-monogamy"

Non-monogamy is a type of interpersonal relationship in which sexual exclusivity is not held as the primary fundamental premise of the relationship. Individuals may form multiple and simultaneous sexual or romantic bonds. This can be contrasted with its opposite, monogamy, and yet may arise from the same psychology. The term has been criticized as it may imply that monogamy is the norm and that other ways of relating are deviations.