Lindy West’s new memoir, Adult Braces , ends with a portrait of unconventional domestic bliss. She has moved to a cabin a few hours outside of Seattle with her husband, Aham, and her husband’s girlfriend, Roya, who is now also her girlfriend, Roya. Happiness in triplicate! This arrangement gives West an extra hand to do the dishes, an extra brain to remember to pay the bills, an extra warm body to have sex with Aham when West is feeling depressed and isn’t in the mood. The trio has even