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Bananaquit
Since: Jan, 2001
My mother has told me about this movie, but didn't remember it's title or anything beyond the plot: a policeman is trying to catch a sadist murderer. He gets help from a woman with masochistic tendencies. He sees a bunch of BDSM themed paintings in her house and understands that she's the right person to help him. I looked everywhere and couldn't find any film like this one. It's possible that it was made for TV, like Lifetime.