To the list of famous literary couples—like Romeo and Juliet, Heathcliff and Cathy, Lancelot and Guinevere—we can add Edward and Bella. Told in the four-book Twilight series, the love story between Bella and Edward, a vampire, has become a pop-culture phenomenon.

Each of the four books in the Twilight saga has topped the New York Times Best Seller list and has been translated into 38 languages. The books have inspired a major motion picture series. The second movie, The Twilight Saga: New Moon, will release on DVD and Blu-ray Disc on March 20th; the third movie, The Twilight Saga: Eclipse, is scheduled to hit theaters this summer.

But why is the series, written by Stephenie Meyer, so popular with teens and adults alike? The story is set in high school, so the books generally are found in the Young Adult section of the book store. However, the books have crossed age barriers and are more universally appealing.

Undoubtedly, some of the popularity can be attributed to the vampire-centered theme. The vampire theme is the basis for several popular book and television series. The creation of a love triangle with the introduction of Jacob, who is a werewolf, adds yet another level of the fantastical to the Twilight story.

The Twilight books have something for everyone—young adults, vampire fans, and romance readers alike. The books are an easy read; the story is appealing, suspenseful, and imaginative; and the characters are down-to-earth and relatable—including the vampires. Meyer's descriptive writing style puts the reader in the story and makes the fantasy seem believable. The topic of sex is tastefully addressed, and Edward and Bella’s love is pure and idealistic.

Many parents have used the books and Edward and Bella’s relationship as an opportunity to connect with their teens and discuss relationships, choices, and sex. Others just want to know what their teens are reading. Regardless of the reason for reading, most have enjoyed the experience.