In the official novelization of Raiders of the Lost Ark, Marion is 15 years old when Indy starts sleeping with her, and he abandons her a year or two later. In the film, Marion claims that she was a girl during the affair, and Indiana doesn't deny it. Marion Ravenwood is a fictional character who first appeared in the 1981 film Raiders of the Lost Ark. Played by Karen Allen, she enters the story when Indiana Jones visits her in Nepal, needing her help to locate the Ark of the Covenant with a possession originally obtained by her father, Dr.
After 27 years of absence (21 years in the internal chronology of the films), the character returned in Indiana Jones and the Kingdom of Crystal Skull and was once again played by Allen. As Allen sees it, everything was very innocent in those early days between Marion and Indy. And then you get to the ideas behind Marion Ravenwood, and how the two characters know each other.