Much more standard are movies that show long-time friendships which, seemingly inevitably, end up in romance before the end of the movie, usually after one of the two has decided to marry somebody else.
Some people insist that it is difficult for a straight man and a straight woman to be friends without it ending up in romance (or in bed, or both). But I think this is largely because movies and television have been telling us how difficult it is for a very long time.
As it says in the Sarah Caudwell mystery I was just re-reading, "People do what books have taught them to do and feel what books have taught them to feel – it is curiously difficult to do otherwise."
I don't usually do writing prompts, but here's the writing prompt for today. In the next thing you write (or in your work-in-progress), have a friendship between a straight man and a straight woman that does not end up in romance. And if you find it difficult, ask yourself if it is actually difficult, in life, or is it just that you've been told again and again how difficult it is?
By the way, this is related to the "all extra-marital attraction will inevitably be acted upon, sooner or later" point, that I talked about here. It's not exacty the same point, but they reflect the same underlying assumptions.