Devin Gutierrez is a straight man, but he's never dated a straight woman. A transgender man, Gutierrez grew up as a woman. In high school, he was a bit of a tomboy and came out as a lesbian. But even then, he knew there was something more he was missing. "Being in a woman's body, I felt trapped," he said. "I would see myself in the mirror and see the feminine features of my body, and I would hate it." A year ago, the 30-year-old began taking testosterone, and his life completely changed. He expected some of the change: Gutierrez...