Well, she's right - it is soft porn. Some of the scenes are totally unnecessary - meant only to capture a certain demographic, not further the plot.
I'm not really surprised she didn't know, though. There hasn't been an article I've seen that really lays out just how raunchy some of the sex scenes are. It's one thing to talk about Cersai and Jaime - or Tyrion and a succession of women - or Daenarys and doggie-style . . . but has there been a single article that laid out the down and dirty of that 'tutorial' in the whorehouse? If she was in it for a bit role, that scene is probably closer to what they were asking her to do than the plot-driven sex of the major characters.