Mann kann, Frau erst recht(2012)

When Tina discovers her current boyfriend, Frank, has been cheating on her, she rewrites his text to a competition in a male magazine as a story about his small penis. When the story wins, Tina dresses as a man to collect the prize as Frank Schmidt. She is instead offered a job at the magazine and has to deal with pretending to be a man as well as her developing feelings for the chief editor, Moritz.