50 Shades Freed (trailer USA)
I'm waiting for this to come out on Amazon then I'm going to watch all three over the course of a weekend to draw any conclusions. As with Twilight, I read the first half of the first installment and realized I wasn't the audience - in fairness, it's writing is much better than Twilight's.
There are many theories about what makes the Shades series so successful - the most cynical and intriguing is that women love it because it is at heart about being able to buy whatever you want to. There are others. It's worth the viewing just to get it, or not get it but say you tried.