Looking for a specific erotica book

I’m looking for a good book for my girlfriend for Christmas. She really likes erotica stories where the woman is a bad person and just cheats a lot. Is there anything like that out there?? Nothing has to be too specific but that’s the main theme I’m looking for. No like cuckolding or humiliation stuff please. A lot of it is like an affair with one person, im hoping there’s some out there where they just sleep around a lot.