This may get long, and there’s a History lesson included, so, you were forewarned!
All of those dirty little four-letter words? They ain’t French! They’re Old English/Ancient Anglo-Saxon. Starting around 1066, The French invaded England on a number of occasions, and, being the conquerors, instituted their language as the primary language of the country. (Hence the many, many French words borrowed by the English language.) All of the Gentry spoke it, but commoners, being poor, uneducated vassals, generally stuck to their native tongue. I mean, how often would a peasant see a titled noble, much less be allowed to speak to them? Anyway, the end result was that the commoners speech was considered vulgar (which, btw just means “common”. The pejorative sense was added later.) and were not to be spoken in “polite” company. Most of them aren’t, technically speaking, curse words, only those with religious connotations. At the end of the day, any time you use a polite euphemism for a “dirty” word, you’re probably using the Latinate equivalent to the ancient, Germanic-based words of our English ancestors. (Well, mine, anyway…)
Donuts are nasty, disgusting, foul things, and aren’t fit to eat!