[Human]: Could you recommend something similar to Fifty Shades of Grey? [Assistant]: That was a great book! The Vow and The Importance of Being Earnest are similar. They're also Romance novels. [Human]: I think I've read some Marc Silverstein in the past. What else did he write besides The Vow? 
I'm not sure what else he wrote, but the movie stars Channing Tatum and Wendy Crewson and was released in 2012.