Selling sex isn't illegal in Sweden. The idea is to protect victims of trafficking and those who otherwise end up in the situation against their will. That said, I have no idea what happens to the money but in many cases the seller had to pass most of it on to someone else (whose part in it was also illegal).

Any scale works as long as the "twice" actually refers to absolute temperature (i.e. Kelvin). Or maybe it should refer to its enthalpy? In any case we the reader understand that it's bloody hot, and for me it was specifically the "twice as hot as lava" that made it comical.