Vanilla is often used figuratively and according to Collins Dictionary:
If you describe a person or thing as vanilla, you mean that they are ordinary, with no special or extra features.
- …just plain vanilla couples like me and Tony.
The tensions of the Nixon presidency were replaced by the plain vanilla administration of a friendly, middle-aged, middle-class man from the Middle West.
Vocabulary.com suggests that the term vanilla has a “slightly insulting” nuance:
- This word has another, slightly insulting, meaning: a vanilla movie is plain and kind of boring. A vanilla song is on the blah side. Maybe it's because vanilla food tends to be white and plain that we use this word for other things that are bland.
According to Etymonline this connotation is recent and was , apparently, initially used to refer to sex:
- Meaning "conventional, of ordinary sexual preferences" is 1970s, from notion of whiteness and the common choice of vanilla ice cream.
Questions:
1) Was the figurative usage of “vanilla”, as suggested above, first used with sexual reference, and later spread to more ordinary contexts or was it already used in more general context before the ‘70s?
2) Does the term convey a neutral or disparaging, however slight, connotation, when used referring to people, for instance: a vanilla guy, a vanilla couple etc.
Best Answer
I think that the source of the idea of vanilla as bland and neutral is the expression "plain vanilla"—signifying vanilla as the primary flavoring (of a pudding, ice cream, cake batter, or other dessert). One of the first recorded instances where "plain vanilla' is used in this sense is in Nell Nelson, "Bun's Garden Party," in the [New York] Evening World (July 3, 1890):
For some reason "Sick Baby cream" never caught on—but "plain vanilla" as an undistinguished dessert base did. Another early instance of "plain vanilla" recommends using the psychology of food coloring to jazz up simple desserts. From "Red Sugar and Some Ways to Use It," in the [Sydney, New South Wales] Australian Town and Country Journal (November 10, 1900):
So white is a problem and vanilla is a problem—and the way forward is to introduce additional colors and flavors.
[[UPDATE (June 25, 2018): Ace researcher RaceYouAnytime has found an even earlier instance of "plain vanilla" (actually, "vanilla plain"), with the implication of simplicity and purity made explicit. From "Woman's Pet Tipple," in the Fort Worth [Texas] Daily Gazette (August 31, 1887):
The source of these insights is a waitress who works at a soda fountain.]]
As the website quoted in lbf's answer observes, one early figurative use of "plain vanilla" is in "Willkie Evolves a Plain Vanilla Foreign Policy for Republicans," in Life magazine (October 19, 1942), which, aside from its title, offers this figurative passage:
Another early figurative instance again involves political parties, but this time Democrats are "plain vanilla." From "John White Issues Blast at Shivers," in the Sweetwater [Texas] Reporter (January 8, 1954):
Then comes "plain vanilla" in the sense of "garden-variety" or "dime-a-dozen" athlete. From "Hoot Gibson Proves Grit, Determination Pays Off," in the [Abilene, Texas] Optimist (September 17, 1954):
And again in the context of sports, from "After-Game-Party Held; What a Game And What a Party," in the [Abilene, Texas] Brand (February 28, 1958):
In short order, "plain vanilla" became a descriptive term for all sorts of inedible things—to the human beings who serve on censoring boards (in the Crosbyton [Texas] Review, August 7, 1958); to theatrical entertainment (in the [Abilene, Texas] Optimist, November 20, 1959); to low-cost automobiles (in the [Fort Hood, Texas] Armored Sentinel, May 27, 1960); to electric ranges (in the Crosbyton [Texas] Review, February 8, 1962); to a shirt color (in the [Denton, Texas] Campus Chat, March 23, 1962); to teachers (in the Tulia [Texas] Herald, April 12, 1962); to everyday people (in the [Denton, Texas] Campus Chat, October 10, 1962); to football formations (in the Crosbyton [Texas] Review, October 11, 1962); to (finally) sex education, although not sex itself (in the [Philadelphia, Pennsylvania] Catholic Standard and Times (June 18, 1965).
The predominance of Texas periodicals in the preceding paragraph is not a sign that Texas was a hothouse of "plain vanilla" idiomatic experimentation; it just underscores how limited other states' accessible post-1920s newspaper databases are. The Portal to Texas History archive is restricted to small-town newspapers and college newspapers—no big metropolitan dailies with their many copyrighted and syndicated stories from wire services and prominent national newspapers—but it still manages to host a respectable amount of relatively recent searchable content.
In any event, it seems unlikely to me that the writers of these various instances from the period 1942–1965 were taking their cue on "plain vanilla" (knowingly or not) from the world of sexual preferences.
As I noted earlier, the original idea of "plain vanilla" was not that it was unappealing in itself, but that it could serve as a base for a multitude of interesting variations through the addition of other ingredients. Inevitably, however, the relative simplicity of "plain vanilla" invited critical dissatisfaction based on the predictability and unimaginativeness of "plain vanilla." This pejorative element certainly lingers as an overtone of describing something or someone today as "vanilla."