Since the early 2000s, the phenomenon of the "down low"--black men who have sex with men as well as women and do not identify as gay, queer, or bisexual--has exploded in news media and popular culture, from the Oprah Winfrey Show to R & B singer R. Kelly's hip hopera Trapped in the Closet. Most down-low stories are morality tales in which black men are either predators who risk infecting their unsuspecting female partners with...