I had a quick punt with a girl down near the French / Spanish border, in the back of an estate car, last year. She was Italian, and spoke little english (none actually) but we conversed in the language of punt...
She seemed fine with the car experience, and told me where to drive so that it was a little more private - it was about 300yds up a farm track.
She was very pleasant, didn't smell or taste odd, but I didn't get my face very near for RO - she was fresh enough. She gave OW and then straight sex, which was fun as I haven't done it in the back of a car since 1988... it cost EURO50 I think.
Obviously these girls change around all the time and stay in local cities mainly, get dropped off in the mornings and picked up later by their owners. It's kind of pick and mix really..... but I would try it again if temptation got the better of me. If you don't try..... ?!