Is toilet humour cause or effect?

Here's a question on World Flush Day, the day after World Toilet Day: is there a correlation between the prevalence of scatological humour in a society and how seriously it takes toilet hygiene? Anecdotal evidence would suggest that the more mainstream a society's toilet humour is, the more blasé it is about keeping its toilets spic, or for that matter, span.

Pre-modern Europe had its bestselling writers like Chaucer and Rabelais generously spraying scatology all over their oeuvres. As historical dramas on HBO scientifically confirm, London, Paris, Madrid et al were no pretty places then. The jury is still out about whether the West cleaned up its act after issuing fineable public hygiene laws, or after toilet chitchat took a backseat to things like existentialism and postmodern prattle over Kim Kardashian's derrière. In India, however, the potty-mouth rolls on. The Bengali folktale about Gopal Bhar caught on a boat when The Urge strikes him, or Salman Rushdie's Saleem Sinai encountering a "champion defecator" who produces "the longest turd" he has ever seen, may show a healthy respect for bowel-'n'-consonant movement. But all this shit-shat may trivialise the actual horrors we keep encountering in Real India. Only after a proper study can one confirm whether a total ban on toilet jokes is needed in Swachh Bharat or not.