As I moved from the 50s films to the 60s, the fayre became more iffy, causing me to retreat to the 50s again for now:

The films became darker in among the up tempo music. First really dark film I recall was Lord of the Flies … there was one just now called pretty poison, with Tuesday Weld, playing to type (Lolita) … other films were nastily themed too. Then in the 70s came the open, slow motion gore and perversion … an historian could easily trace the descent in tone.