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This needs to be a well-defined psychological principle. I do stuff like this all the time
(programming.dev)
Get good loot from a toolbox in Fallout? Gotta check them all now
When the Munich public transport introduced new trains around 20 years ago some of them had porn images stuck to the inside of legs of some of the benches. You can be sure that teenage boys find them.
The numbers quickly dwindled but it took the company years until they had them all removed.
I never learned how that happened. We suspected that someone might have sneakily applied them during production or before delivery, as the trains were brand-new.
I doubt they were "official" stickers ๐