American photographer Malerie Marder is known for her deeply personal and intimate – if not erotic – work. So when TIME asked her to shoot the stars and the director of the upcoming film based on the global phenomenon Fifty Shades of Grey, Marder had to face her first hurdle. "My work tends to revolve around an intimate moment or private moment," she says. "For this shoot, there were many people involved — and at a certain moment, at least 20 people in the room — so I had to make it feel the opposite. It’s never so much about reality as [it is about] believability in the moment or a felt experience."