Jean M. Twenge, Hannah VanLandingham, W. Keith Campbell. The Seven Words You Can Never Say on Television: Increases in the Use of Swear Words in American Books, 1950-2008. SAGE Open. July-September 2017: 1-8.
Abstract: Evidence is accumulating that American culture has become more individualistic since the 1950s. In the present research, we focused on one plausible manifestation of individualism, the use of swear words in cultural products. We examined trends in the use of the seven words identified by George Carlin in 1972 as the “seven words you can never say on television” in the Google Books corpus of American English books from 1950 to 2008. We find a steady linear increase in the use of swear words, with books published in 2005-2008 twenty-eight times more likely to include swear words than books published in the early 1950s. Increases for individual swear words ranged from 4 to 678 times (ds = 6.58-45.42). These results suggest that American culture has become increasingly accepting of the expression of taboo words, consistent with higher cultural individualism.Ben Zimmer tells me this is shoddy scholarship and points to this piece in The New Republic.