In her new book Future Sex, Emily Witt examines new ways of fulfilling desire.
Like most of us, Emily Witt grew up with a set of expectations about how her life would proceed. It was pretty much the same sort of life her parents, most of her friends, and most of the characters on TV and in the movies had: after a period of experimentation, she envisioned, as she puts it, "my sexual experience eventually reaching a terminus, like a monorail gliding to a stop at Epcot Center.…