I've had several friends read this series and give up on it, They all said something along these lines:
1. Starts off as a pretty good vamp/detective story, continues this way for a couple of books.
2. Turns into 50% vamp/detective and 50% descriptive porn novel for 1 book
3. turns into 95% chick walking from one large orgie to bestiality type sex back to a different orgie and 5% detective story
4. Gets even worse then they gave up.
I find it kind of sad that an author who showed promise in her chosen field based her main character so clearly around fulfilling her own wishes and desires then just dissolves into writing strange porn. Kinda shows that she has some strange issues... (See above examples by Endmaster and just about anywhere online and its obvious she writes to pretend its her)