Here we are in a world that supposedly treasures the ability of consenting adults to do whether we want yet paid sex is still illegal and in fact being restricted further in places it was formerly allowed.
That's a fair take, but I don't think it really applies to the article: almost all of the countries mentioned in it have prostitution some flavor of legalized via Abolitionism or Legalization (Germany, the Netherlands, Switzerland) or Neo-Abolitionism (Sweden).
One idea: Provide stalls that are just large enough for a single car to fit with a gap of 1m between the stalls. Put a hole in the wall on the passenger side where the doors would be so that they open into the hole and allow someone on the passenger side to exit into the gap.
Make it narrow enough that when a car is inside, only one door can open? So either it’s the passenger door, so the prostitute can get in and out, or it’s the driver door, in which case she can’t get in in the first place?
How bad must these people feel about themselves after though. Driving out to some seedy "sex box" to pay to have uncomfortable car sex. The self disgust on the drive back must really be something lol.