Thora Birch was shot in actual sex scenes with her father watching.
Her dad watched throughout, as his daughter was made violent love to by her co-star.
The American Beauty star filmed the racy scenes with her co-star Dean Winters for The Winter of Frozen Dreams, while her manager and dad Jack Birch was on the set every day giving orders - even telling director Eric Mandelbaum where to place his camera, according to The New York Post.
According to reports dad kept saying "harder, faster," and giving Dean Winters the thumbs-up sign.
Watch for the book: Daddy Dearest.
