I tried them over the holidays and am now on the 10th....
I am surprised by how much I am enjoying them. They are getting more sexual, but I think this has a lot to do with the growth of the character, and so far, I haven't found it over the top.
I am about to start Narcissus in Chains and the description sounds like the sex factor gets ratcheted up a few notches. If it just becomes sex and the good thriller/mystery part stops then I'll probably lose interest. Right now, I am really enjoying them. It's fun action/crime stuff with a supernatural twist.