Here's why:
* Stock Characters: Romance novels often rely on familiar character archetypes like the "bad boy" or the "damsel in distress." This allows readers to quickly connect with the characters and understand their roles in the story.
* Happily-Ever-After Endings: A defining characteristic of romance is the hopeful and optimistic conclusion. The protagonists usually overcome obstacles and find love, leading to a happy ending.
While romance fiction can have subgenres, the use of stock characters and happily-ever-after endings is a common thread across most of them.