"When Rachel Krantz met and fell for Jacob, he told her that he was looking to make a commitment--one that did not include exclusivity. Both anxious and excited at the prospect of a different way to commit, Krantz entered a relationship built equally on love and liberation. And as an inveterate journalist and writer of extraordinary perceptiveness and emotional nuance, she not only put her heart on the line, but kept painstakingly detailed notes,...

"As long as she can remember, Leah Dieterich has had the mysterious feeling that she's been searching for a twin--that she belongs as one of an intimate pair. It begins with friends, dance partners, and her own reflection in the mirror as she studies ballet growing up; continues with physical and emotional attractions to girlfriends in college; and leads her, finally, to Eric, whom she moves across the country for and marries. But her steadfast, monogamous...