Marie Liljedahl was born in Stockholm and started acting at the age of 10 and was a member of the Swedish Royal Opera Ballet by the time she was 12. It seems that she would have had a career as a legitimate stage actress or ballerina if she hadn't been discovered by the legendary smut auteur Joseph W. Sarno who cast her as the lead in his coming of age story Inga (1968) when she was only 17 years old, and then in the sequel The Seduction of Inga four years later. She also worked with Jess Franco in Eugenie... the Story of Her Journey Into Perversion (1970) where she had some fairly explicit lesbian scenes with Austrian hottie Maria Rohm.
In 1968 she posed for Playboy Magazine and these are some of the pictures.
Now this is where the mystery begins. The picture above is from Playboy's 'Flicker Flicka' spread from 1968. The next picture is from 'The Girls of Scandinavia' which was released in 1967, and Marie is wearing the same purple bikini bottom.
Now this could be explained by Playboy simply using some pictures from the same photo shoot in two different magazines in different years. But then I found this picture of the German skin magazine 'Schlüsselloch.'
What the hell is going on?! Somebody fire up the Mystery Machine!
So anyway, here are her boobies in the opening credits of The Seduction of Inga if anyone is interested.