Mitől pont francia a "francia csók" vagy a "franciázás"?

Origin of French Kissing

Most people incorrectly assume the term “French kiss” originated in France. Actually, the term entered the English language in 1923 as a slur on the French culture (which was then deemed infatuated with sexual matters). In the French language, there is no such thing as a “French kiss” – the French prefer to call it a “tongue kiss” or “soul kissing.”