One of the hottest growing segments of the romance genre is male-on-male (M/M) romance--gay romantic fiction mostly written and read by straight women. Featuring traditional romance conventions, including mistaken identities, star-crossed lovers, and happy endings, these stories show both physical and emotional intimacy between men. M/M builds on the popularity of recent television shows and movies like "Queer as Folk" and "Brokeback Mountain," but its origins are in the slash fiction genre of the 1990s in which erotic fiction about television, book, and movie characters found a lively audience online. Like slash fiction, many M/M titles are available online only. Just like hetero romance, there is something for everyone in M/M, including a variety of historical and contemporary settings, as well as elements of other genres, such as mystery, Westerns, and sci-fi. This article lists ten M/M romances for a core collection.