I take a bit of a different stance on this particular question, as although we could list an arrary of books and films alike that fit into this catagory, I wouldn't personally go as far as to say there is a leaning towards romanticizing the interconnectedness of women by which evolves through close friendships of the same sex. I think there are people who come into your life that can be very compatitable as much as I think there are some people who can take on a more fire and ice spectrum of relatability. Your not always going to find someone who fuses into your life without friction but not everyone who causes friction is going to be someone you don't want to have around either. Each of us is drawn to different types of personalities and its our interests, both mutual and different that set us apart from one another. Women have the tendency of forming sisterhood bonds with each other, which makes their connection both rewarding and difficult at times. I think for the most part, books and films, lend themselves to the honesty of what is experienced in our own lives, but tend to take on an element of fantasy in certain storylines in order to encompass a larger picture.
I personally can speak on the "Travelling Pants" series, as I watched the first film before reading the first three books in the series. I was on the fence about this series, both in film and book formats, as I wasn't sure how they were going to treat the subject matter. What I found in the books is a riveting honesty about the difficult lessons that we have to go through in life as individuals and the choices we have to make along the journey we take to keep our relationships intact. Life affords lessons that help shape and guide us throughout our days, but its the people who stick with us, who are determined to help us smile when we'd rather cry, and hold us up when we forget how to stand. They are usually the same people who stand out in our minds as the days move forward.
There is a lot inside the book series to these characters lives, and I think the first film did a great job in introducing us to who they are and the different struggles they are each facing at that period of time in their teenage years. Its my goal to read straight through the series, as I want to continue to get to know the girls and have a window into where their lives are headed.
I know the film industry takes flak for being romantically inclined to paint everyday life in nearly every subject they choose to characterize in motion picture,... but personally, one of the reasons I appreciate films so very much, is the brief escape of the woes that might greet you in life to parlay for a few moments into someone else's shoes and to learn about someone else's life if only for that brief period of time. There are gems in modern cinema as much as classical cinema that I think are overlooked by putting too much empathsis on cross-comparing real life to fictional ones. Some might say this is life viewed in a romanticized way, and if that is true, than so be it.
There are always elements of truth in each medium of art. Writing is the expression of the writer whose fuses their life experiences and their outward observations into the written realms, whereas the film maker paints the juxposition of life into the canvas of light, sound, and picture.
It all depends on your personal approach and how you personally internalize what you read or watch on screen. I'd imagine for everyone who responds, we'll all have a uniquely different answer to share.