My favorite dialogue from this episode:
SH: Try to understand
Irene: Why?
SH: Because you cater to the whims of the pathetic, and take your clothes off to make an impression, stop boring me and THINK. Its the new sexy.

I realize this is a fictional character, but what Holmes said here resonates with me strongly.

Yes!!! Women, please stop boring intelligent men by dedicating your entire existance to sex, and think. For God's sake. Some men are actually attracted to your intellect, not your body.

Maybe Irene Adler can control most men with her looks, but not someone at the level of Holmes. I applaud him for that. He may be a fictional character, but there ARE real men who actually think like this.


 

I think that sherlock is impressed by her straight off, and when she appears naked this stops him 'reading' her and that this secretly impressed him. However john seems embarrassed but if sherlock is to be believed,  john has many pictures of naked women on his laptop which seems likely to me as he seems interested In women unlike sherlock.