I did it in a public park during my lunch hour, met my work colleagues wife on a park bench and then we decided to pop into some thick bushes and did it against the wall, when we finished and emerged from the bushes there were two old women sat on the bench so they were only 8 to 10 feet away. Also met the same woman in a woods and we managed to get under the branches of a felled tree only to be joined after 15 minutes by someone’s dog who was walking nearby.