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Psychologists have created a new tool to measure the phenomenon called compersion

woman smiling and cupping her chin
“There is now a validated scale that measures three aspects of compersion: positive feelings toward one’s partner’s relationship with an established metamour (a metamour is one’s partner’s partner), excitement about one’s partner potentially forming a new intimate connection, and sexual excitement that one may experience thinking about one’s partner and metamour together. Individuals may experience compersion in ways that are distinct from others and may even vary toward different partners or at different points in time,” Flicker told PsyPost.