In some countries, pr0stitutes proposition customers and do the dirty right there in the sidewalks, if that's what the latter wants. Clearly that's illegal, but officers can't be out on patrol all the time. I imagine this is something that happens more often than authorities would like, especially in countries where pr0stitution is legal. Like Switzerland, for example.
The city of Zurich recently saw the need to install a bunch of drive-in sex booths that kind of look like inter-connected bus stops. Except instead of ads, there are posters with various sexual positions on them, along with a couple that remind folks to wear rubber at all times.
With an estimated annual turnover of around 3.5 billion Swiss francs ($3.79 billion), prostitution has been legal in Switzerland since 1942, with sex workers in Zurich required to have a special permit, health insurance and pay tax.
Each shed comes with a panic button, a laundry room, and showers. While they're decent, they're not the most comfortable-looking sex hub, obviously, but hey, if you can't wait to get it on or are too cheap to pay for a motel, then at least you can do the dirty without ruining the childhood of kids who might otherwise see what you're doing if you did it out in the open.