on Writing Forward:
The biggest selling books in the world are nonfiction and children’s books, but in the adult fiction categories, romance tops the list, outselling every other genre. And romance readers are voracious — I’ve heard that many romance readers consume a book a day.
The main rule of the romance genre is the happy ending. These stories must conclude with a couple figuratively walking into the sunset, hand-in-hand.
But not all real-life or fictional love stories end with a happy couple.