George Orwell warned French visitors to England to be careful in the public loo not to catch the eye of an undercover police inspector. Back in the day detectives (nice work, Sherlock) would lurk in public toilets, and if they thought anyone was there to socialize, would arrest them.
There actually was a problem in Massachusetts with a public toilet on State Route 3, that was used as a trysting place by that set (only the men’s room). It got to the point that a family with young boys couldn’t use the place. In Gary Studds old district, of course.
Ohio had a place like that on Route 33. Johnny Appleseed park.
It got cleaned up by vigilantes in the early 90’s.
The state tore it down a couple years later.