Image credits: All photographs copyright Greg Gorman and used with express permission from COOPH. Our friends at COOPH—the cooperative that brings you killer photography tips, tricks & ideas like these from earlier this year—recently got the chance to work with world-famous photographer Greg Gorman and tackle a particularly sultry subject for their newest video: nude photography. Nude photography is a tricky subject because the line between art and porn is precariously easy to cross if you don’t know what you’re…