swinger
From Longman Dictionary of Contemporary Englishswingerswing‧er /ˈswɪŋə $ -ər/ noun [countable] old-fashioned informal 1 someone who is fashionable and goes to a lot of parties2 someone who has sexual relationships with many people, especially someone who exchanges sexual partners with other peopleExamples from the Corpusswinger• But being the oldest swinger in a town a hot mile's walk away was a life Sombro was used to.• It sets zoning standards for previously unregulated swingers clubs and semi-nude modeling businesses.