Fifty Shades of Grey was badly written with a terrible plot and atrocious 'porn' so why do so many women/people like it?

There's so much out there, and yet people (women mostly) like this terrible series of badly written fanfiction based off of the Twilight series. But this crap made millions, and even has a film that from reviews was even worse than the books. How can anyone read this tripe, let alone admit they enjoyed it. And before anyone who liked it says that I couldn't do better. YES I could! I'm only putting this because someone in my household bought the series to read and I was laughing at their poor choice in reading material.