My mom used to read books like popcorn, she'd read nearly anything. We used to swap books back and forth, so I managed to get her to read Pratchett and Banks, stuff like that.

She drops off a pile and... holy shit. There's two Lustbader books, including "the Ninja".

I read them back when I was a teen. Each book is about 50% extreme ninja violence, and depraved sex. Like, I hid those books from my mom back in the day.