Persson made her film debut as the lead in Mac Ahlberg's Danish-Swedish erotic film Jeg - en kvinde (1965) which became the surprise box-office hit I, a Woman (1966) for Radley Metzger in the United States. She appeared in the German film Das Rasthaus der grausamen Puppen (1967) and in Mission Stardust (1967), and then Metzger hired Persson for a title character in his 1968 French film Therese and Isabelle about a lesbian sexual affair between two schoolgirls.
Persson's film debut was as the lead in a Danish-Swedish erotic film, "Jeg - en kvinde" (1965), which became a surprise box office hit in the United States as "I, a Woman" (1966). She appeared in German films like "Das Rasthaus der grausamen Puppen" (1967) and "Mission Stardust" (1967), and then Metzger hired her for a leading role in his French film "Therese and Isabelle" (1968), which explored a lesbian sexual affair between two schoolgirls.