Not a song but the best I heard lately was the joke that got Max Miller (the cheeky chappie) in trouble with BBC. Max is from the right era anyway.
He explains how he is mountaineering and while traversing a particularly tricky and narrow ledge he rounds the corner to see a young landy completely stark naked. "I didn't know" says our Max, "Whether to toss myself off or block her paqssge..."
Dave the Gnome