Situated within a Tecate's throw of the infamous Marina Dateway, the Fort Mason green has long been a see-and-be-seen scene. Is that why SF Footy, the coed Australian rules football club, sets its goal stakes up there each season? The sport is simple: Advance the ball up field with foot or clenched fist, and then get it through upright posts before someone rips it away. Think soccer for grownups, or football for athletes capable of moving longer than 15 seconds at a time. The sport is typically full contact, as befits a game invented by the descendants of a generation of Irish and British criminals and convicts, but the coed touch version is no less charged.