I actually saw The Private Life of Sherlock Holmes parallels more in terms of the way Mycroft and Irene acted (e.g. the lecture from Mycroft about how Sherlock had been duped and Irene's obvious betrayal). I'll readily admit that I'd probably have to watch that scene at least a few times to analyze it properly (or as well as someone with an unanalytical mind could analyze it), but I was more shocked by the way Irene treated Sherlock, even though we knew by that point that she'd betrayed him. Like I said, I really need to rewatch the scene, but I'm wondering if Sherlock was extra cold because he was unfortunate enough to learn what can happen when your emotions do get the better of you. He let Irene in and she betrayed him. Big time. Of course, it might have also been for show - to appease Mycroft and make it look like he was truly back in control.

However, I think Irene was really only turned on by Sherlock's mind. I think she did all that flirting to get a reaction out of him and see how he would respond. He obviously did excite her, but, once again, it was in terms of the game they were playing.

I'm with you on this - I thought that, like Sherlock, she likes a challenge.

I think that's why they're two of a kind. They love a good challenge and crave mental stimulation.

And now I have to find it somewhere, preferably with subtitles. :)

Are you referring to "A Scandal in Belgravia"? I'm not sure if there will be any versions of it with subtitles yet, but I'll let you know if I come across any.