Earliest Movies About Taboo Subjects

Nothing before 1934 (Hays Code).

The earlier, the better, as they seem to handle the subject matter better, especially with quality writing, instead of being crass.. Nothing after the 1970s. From any country. For some reason, they just seem to be better. Nothing silly, but something mature. I'm watching "Pale Flower" and loving it, and there's a mention of a guy who is a "dope addict"… I do remember liking "The Man With The Golden Arm", too.

Not the exploitation stuff like "Reefer Madness"