A Story in the Naked In School Universe
I don't know if Karen Wagner was inspired by this story, but it appeared shortly before she stated the genre. The author is unknown. Rather than naked kids, the teachers are naked with the (successful) intention of inspiring learning.
Tom Watson started out sexually servicing his mother and two sisters before he even had a girlfriend. By a quirk of circumstances, he and his girlfriend saved his middle school from an attack by some Muslim terrorists, and killed four of the terrorists in the process. Guess what: this got them thrown out of school. Eventually, those two and Tom's sister became vigilantes. Of course, for fun, there was a lot of sex.
He buys a house and finds that any female that he invites into the master bedroom or ensuite becomes sexually active with him. He finds that the previous owner has created a powerful aphrodisiac that is pumped into these rooms.... along with multiple cameras that record the sessions. He had also installed cameras into the neighbour's houses - it was a voyeur's paradise.
Hogwarts Professor of Herbology, Neville Longbottom, a legend in the wizarding world is surprised to be confronted by a girl bearing a marked resemblance to his lost love, Luna Lovegood.
Jessica seduces her father into having sex with her. (Disclaimer: This is story about incest between a father and daughter. If you're not into that thing, kindly click the back arrow.)
Because of drug side effects, Peggy is starved of sex by her ill husband. he does however persuade her to get her share elsewhere when a chance overheard conversation at work leads her to planning a trip to a glory hole.