When did profanity in movies start to become fashionable?

I was wonder if anyone knew anything about the first movies to have cursing in it. I tried researching this online but i could not find anything specific. It's hard for me to imagine that movies back in the 1950's had F bombs in it... lol. From what i know, I would guess sometime in the late 1960s would most likely be in the ballpark, but i was wondering if there were specific films that anyone knew of that started this trend!