What would the world be like if all pregnancy was intended, not unintended as it is nearly half the time now? Considerably better, Margaret Pabst Battin suggests in Sex and the Planet, a provocative thought experiment with far-reaching real-world implications. Many of the world's most vexing and seemingly intractable issues begin with sex-when sperm meets egg, as Battin puts it-abortion, adolescent pregnancy, high-risk pregnancy, sexual violence, population growth and decline. Rethinking reproductive rights and exposing our many mistaken assumptions about sex, Sex and the Planet offers an optimistic picture of how we might solve these problems-by drastically curtailing unintended pregnancies using currently available methods.