What is Outdoor Intercourse Day?

Outdoor Intercourse Day began at least by 1969 at WSU. That year was my Freshman year at WSU. The Editor of the University paper was fired for publishing a picture of four feet behind a log, two pointing up and two pointing down. One pair of feet were male and the other were female. The article was celebrating Outdoor Intercourse Day, May 8th or the 69th day of March.