Summer Lovers (1982)

A young American couple, Michael and Cathy who have just graduated from college, have known each other about 10 years and have been together about half that time go to of Santorini, a Greek island for the summer and are dazzled by the beauty and the uninhibited people surrounding them. Michael meets and begins an affair with Lina, a French archaeologist working on a dig. Cathy discovers this and goes to confront the other woman. Lina is quite taken with Cathy's photographic work, and the three become very close.