I've been reading through a lot of the forum where the two writers of the the POTC movies hang out. The following is a comment by Ted Elliot. It's not a spoiler, though the thread it comes from is. So if you want to read the whole spoilery bit, go here. But the comment/question itself is something I've talked about in the past.
Here's a concept:
Is it possible for a relationship between a man and woman, even a man and a woman who are attracted to each other and have great on-screen chemistry, to have value to each of them and be important to their development as human beings *without* a romantic/sexual component?