Relationships between women are often cast in binary terms, either as backstabbing competition behind the scenes or soft-filter best-friend-forever moments. Yet the simple truth about friendship is that it's never simple: not for eight-year-olds acting out adulthood through rich Barbie fantasies, not for teens trying to bridge the chasm of racial and cultural divide, not for kid-free singles watching old friendships weaken with each new partner and child that happens to someone else. Yet, however problematic women's relationships with one another can be, they can also be intense, intimate...