The french kiss is a kiss where the participants' tongues are used to touch the other participant tongue or lips. This is an expression I have heard since I'm little, but I am very curious about the possible origin of this expression. It seems that the expression is British, as there is a lot of expressions there using the word "french", such as French letters, to take the French leave or excuse my French.
Wikipedia seems to describe the etymology this way :
A French kiss is so-called because at the beginning of the 20th century, the French had a reputation for more adventurous and passionate sex practices.
But is that really all ? Is the expression that recent ?
Best Answer
French kiss is from 1918 according to The Routledge Dictionary of Modern American Slang and Unconventional English.
The following source cites its first usage in the WWI Private Lindner's Letters:
(www.popsugar.com)
As noted in Quora, the term French was used in a number of prurient expressions at the beginning of the 20th century: