When eighteenth-century American men described "with a swelling of the heart" their friendships with other men, addressing them as "lovely boy" and "dearly beloved," celebrating the "ardent affection" that knit their hearts in "indissoluble bonds of fraternal love," their families, neighbors, and acquaintances would have been neither surprised nor disturbed. Richard Godbeer's groundbreaking new book examines loving and sentimental friendships...