All your extremely scientific questions about sex (and some you definitely have never thought up) are answered by science journalist Mary Roach in her inimitable, readable style. Can a person think themself to an orgasm? Why doesn't Viagra help women or, for that matter, pandas? Can a dead man get an erection? Is vaginal orgasm a myth? And how can science help us have better sex and orgasms? Inquiring minds are extremely curious.