We are in the middle of a cultural revolution, where the spectrum of gender and sexual identities is seemingly unlimited. So when author and journalist Lisa Selin Davis's six-year-old daughter first called herself a "tomboy," Davis was hesitant. Her child favored sweatpants and T-shirts over anything pink or princess-themed, just like the sporty, skinned-kneed girls Davis had played with as a kid. But "tomboy" seemed like an outdated word-why use a word with "boy" in it for such girls at all?