20s? That what we're calling the turn of the century? I guess if you've set it there's nothing we can do. Would "Something about Mary" be considered romantic? That's a good movie if you haven't seen it. Which you definitely should have. I don't know many romance flicks. I think Ghost might have been the only romantic movie I've ever seen. Swayze and Whoopee Goldberg. But Swayze haunts that movie now.
Like every four in ten movies from the 90s is a romantic one. Here's my list. Pretty Woman My Girl Romeo+Juliet, somewhat overrated though Say Anything A Walk In The Clouds Blue Valentine, not new, don't watch if you don't like tragedies True Romance, must watch A few international ones, really worth a watch Amelie (French) The Classic (Korean) About Love (Japanese) Love Letter (Japanese) The Girl Who Leaped Through Time (Anime, Japanese)