There are two issues here which mixed up. First issue is the preference of an individual woman and the second issue is the effect of society on our perceptions.
I live in Japan where the large versus small cock paranoia is less present than in the USA. People have a healthier attitude as a result. Porn show mostly men in the 8cm to 20 cm range. The basic idea of a porn here is for a normal guy to project himself in the movie. If you only show Holmes or Mandigo, guys become obsessed with the idea that only a huge dick can satisty a woman. They cannot project themselves in the character.
The effect on society of USA style porn can be seen clearly in the fact that many will assume that a woman with a big cock fetish is a slut while a woman liking small dicks is just a fine lady. This would not happen and does not happen once a society stops going nuts about big cocks.
So definitely, porn in North America sucks in that respect.
Now going back to an individual woman. A woman is entitled to whatever fetish she feels like. A woman who dreams of a ten inches cock, finds the dude (probably on the internet!), finds that he is charming, intelligent, and has good job, and stays faithful to the dude is a slut? On the other hand, a lady who loves fucking 5 inches or less and goes to an arena full of them, is not a slut??? Horse shit.
There should be no correlation between liking a big dick and being a slut. Zero. Some people like blue eyes and white skin. Some people like a tan or a darker dude. Everyone is entitled to his "small" fetish.
Porn sucks to make us believe that a guy in the 6-8 inches is average and that 9 is barely long.... but a woman who like big cocks cannot be blamed for our stupid porn industry and its effect on the poor dudes that we are.... big or small.
I am certain that some of the gals on this discussion are great ladies and I would love to meet them. They would look at my dick and most likely say: no thanks. But, so what? Once you have a healthy attitude you accept these fetishes.