As weird as its sound, porn of today is like going to the ice cream shop of unlimited toppings. Think about it:
You start with the fact of porn, and keep adding toppings to your liking. You can combine anything and get porn like: Ebonic, Lesbian midgets into S&M, or Bisexual Granny Tranny's. The possibilities of combinations are endless, but yet, its almost like they are being tested.
The whole thing sounds stupid^^^^^But it was something that popped in my head one day.