A childhood belief about sex

When I was 16 and in my junior year of high school we took a trip to VT over Thanksgiving break (which we did every year) and along the way we stopped at this local restaurant for dinner. And it was pretty slow that night so my parents, brothers, and I were chatting with our waitress and my dad asked about the history of the town and we find out that the building the restaurant was in was once a brothel.
Now I don't know exactly how the exchange went, but somehow I said something to the tune of "what kinds of soup did they make?" And everybody stops and looks at me all weird and I'm like, "what? Isn't a brothel where you make soup?" and explained my reasoning for thinking that was that broth was a type of soup and so a brothel must have been an old timey soup factory. And my dad chuckled and pulled me close and said "honey please stay innocent forever"
And that's how I found out what a brothel really was.
For background I was always a bit naive and I was also quite sheltered, so I just never heard of a brothel before.