Judging the boundaries of good taste, propriety, standards in private and public life are intrinsic to the publishing risk. What can and cannot be said is more than an issue of the words that are used and when they are used. Words change as they move from mouth to mouth, page to page, and screen to screen.
Taboos broken by publishing are briefly thought shocking, and then rapidly adopted in humour and familiar settings.
New uses of the once forbidden become commonplace, but some words remain particularly diabolical, revolting or totally forbidden, with new ones banned from time to time. But words are good at jailbreaks and disguise.