I found this italian forum when people could download the pdf file of the books, and there were a lot of them.
I started to read until the 7-8th book and then i stopped because i realize that in 7-8 books the story had different characters, different enemies, but the story proceeded in the same way.
Anita lives her life, she meets a special person who falls in love with her, the evilish problem occures, the special person and Anita (with the help of Jean-Cloud) try to stop the evilish problem with a lot of wounds and blood, end.
A classmate told me something very similar about the later volumes. That over time the monster hunts and other plot lines become less and less important and Anita mainly has affairs with men.
And that up to volume twelve.
Always with the same pattern of action.
I can only wholeheartedly agree with you !!
In addition, Anita is tough and, at least according to her characterization from the first volumes,(sorry for the language) not a slut who climbs into bed with every male individual who came over by chance.