DuckCorp Dico

Found one definition

1.                 From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   swinger /swˈɪŋɡə/
   Swinger <masc>
            Note: jemand, der Gruppensex und Partnertausch praktiziert
            Note: person engaging in group sex or swapping sexual partners