I read an article recently that struck me as very interesting. It was written on the blog from Christian Production company Art Within's website. It discusses how casual and common sex is in most romantic comedies, with some characters sleeping together even on the first date. The producers of Silver Linings Playbook made the movie in such a unique way that the audience is actually rooting for the couple to not sleep together. The movie is not an openly religious one, but it does have some Christian elements to it. The article is pretty long, but it's worth it to read the beginning. You can find it here.