A chance encounter in the forest: “Hey, fellow, you got anything I could squeeze between these?”

I suspect this photograph shows (or is intended to suggest) a prostitute giving a quick blowjob in a public park. The combination of outdoor setting, street clothes, and especially the cigarette still held in the hand holding his penis, seem telling:

Is it just me, or does the bent-over lady look just a bit pissed off about the photographic interruption?