She's all about anal. Practically all she does aside from squirting.
Not that I mind, of course. She's one of my favorites. And I'm sure that that Anal reaction she had was likely one of those, "Her First Anal" scenes, which was likely staged for her to look like it was a surprise to her. That, or she wasn't getting paid to take it in the ass that day, and someone tried to sneak it in