Most of us assume that sexuality is fixed: either you're straight, gay, or bisexual. Yet an increasing number of young men today say that those categories are too rigid. They are, they insist, "mostly straight." They're straight, but they feel a slight but enduring romantic or sexual desire for men. To the uninitiated, this may not make sense. How can a man be "mostly" straight? Ritch Savin-Williams introduces us to this new world by bringing us the stories of young men who consider themselves to be mostly straight or sexually fluid. By hearing about their lives, we discover a radically...