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'Notorious' (1946)

Ingrid BergmanCary Grant
OK, so Cary Grant and Ingrid Bergman don't have on-screen sex in this classic Hitchcock film, but they do talk about "having dinner" in a suggestive way. And, more to the point, they engage in what was called the longest kiss in the history of the movies -- except that the kiss is interrupted... American Movie Classics