I used to volunteer in a public library, usually after school, when the library was full of kids.
The funniest thing happened over and over again. You'd be shelving books, when you'd suddenly hear giggles from one set of stacks. It happened again and again, and over about three years.
I kept going over there, once the kids had left, trying to figure out what they were laughing at. There were no sex books there, or anything else you'd think would create so much giggling.
Finally, while shelving books in that section, I figured it out. There was this old book from the 1940s shelved with the other books on parties and entertaining. The title?
"Gay Parties for All Occasions"
Funny stuff. Reminds me of a favorite George Carlin joke "remember the first time you heard of a cock fight? 'no man it's chickens'"