I would recommend the two films that hugely influenced the Italian films as well: The Night Porter (1974) and Salon Kitty (1976). They're much better made than what would come later, but their connection to the genre is undeniable.
Lee Frost's Love Camp 7 even predates these (1969) and is probably the first seed of the genre. It's a mean-spirited, unpleasant film, but relevant to it all.
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