She seemed very different in this scene in a good way. I heard her on an interview that her and Peter North were so into it they forgot the cameras were there. She said it was one of her most memorable and best scenes. I would agree.
If I'd been in porn then, I would've LOVED to work with Christy. She's always so passionate and vocal...she always looks like she's truly enjoying herself and relishing her work. That's hard to fake if not impossible.