You've found the book, Cyberspace Romance. You've also found something else. Look at the titles of the books surrounding this one: Online Matchmaking, Beyond Friendship and Eros, Programs to Reduce Teen Dating Violence & Sexual Assault.
Because LC call numbers arrange books by subject, books near each other will be about similar topics. Once you find a book on your topic, you may find something even better by browsing the shelves around it.