PHILOSOPHERS, THEOLOGIANS, ARTISTS, AND BOY BANDS HAVE WAXED poetic for centuries about the nature of love. But what does the brain have to say about the way we carry our hearts? In the wake of a divorce, science writer and single mother Kayt Sukel made herself a guinea pig in the labs of some unusual love experts to find out. This Is Your Brain on Sex is her lively and hilarious examination of the big questions about love and sex, previously published in hardcover as...