This is my all time favorite poster!! The man "flashing" the statue is a man by the name of, J.E. "Bud" Clark. He is a restaurateur, and owner of a business by the name of the Goose Hollow Inn. The bar/restaurant is located in the heart Portland, Oregon, and they claim to have "the best Reuben on the West Coast".
The great part about the man in the poster, is that he was elected as the 44th Mayor of the city of Portland! Of course, long before he ran for mayor, he "exposed" himself to the statue in the park. After he became Mayor, the poster became a huge hit, and Bud Clark was interviewed by many major newspapers, and magazines, and even appeared on a popular late night TV program.
Whether or not you liked his style of politics, he was a man that you just had to like! With his unique cry of, "Whoop-Whoop", and commuting around the city by bicycle, he will always be remembered for his eccentricities.
If you want more info about the poster, here is a link to the photographer's story. http://www.errolgraphics.com/pages/exposestory.html