All February Wanderer is doing a romantic tropes theme for Thursday Movie Picks. I suspect this is going to be a bit difficult for me because I don't have a ton of romantic movies I love, but here's what I came up with.
1) She's All That - While this one isn't necessarily about two parties faking it, one of them is (initially so we're counting it) The stair scene remains iconic.
2) How To Lose A Guy in 10 Days - YOU KILLED OUR LOVE FERN!!! This movie is pretty dumb but it's also very endearing.
3) Easy A - I'm not sure if this technically qualifies as a romantic movie, but it's the first film that came to mind when I saw this theme. All of Olive's relationships in this are fake.