I got caught by police doing that in the back of a VW bug when I was 18. We were pulled over at a rest area near Roseburg. After the cop made sure everything was mutual, he told us directions to a park in Myrtle Creek that would not be patrolled if we wanted some privacy. We took advantage of that kind officer.
Haha. It basically was. Ended up in Fir Grove Park based on the officer's opinion. The funny thing about that night was that my best friend's dad was a fire chief and ran his police scanner all day. They heard about my exploits over the scanner. Embarrassing.