Vampire romance and erotica are very popular genres. They are fun to read; try them.
My wife and I both read Laurell K. Hamilton, Kim Harrison, Charlaine Harris, Christine Feehan, Sherrilyn Kenyon, and others. We enjoy the sharing.
Parents often share books with their children. Stephenie Meyer is safe sharing, whereas the authors i listed above write books that most parents would feel uncomfortable sharing with their daughters.
That's the reason; access to a collective shared experience.