How did sex begin? How did it first evolve to become so colorful and passionate in the human species? To what extent is our love life shaped by our genetic heritage? And what will the future of sex look like? In this new installment of the "Brief History" series, David Baker turns his gaze to one of the deepest and most powerful forces that define the human species: sexuality. From the chemical process of two microbes sharing DNA about two billion years ago, to modern phenomena like Tinder and sexbots, the author provides a lucid view of one of the most undeniable driving forces of our species. Baker traces sex through our family tree, from dinosaurs to primates and early humans, showing how sex has evolved across the hunter-gather, agrarian, and modern eras, culminating in a period where the current nature of our sexual lives has no historical or evolutionary precedent. But he doesn't stop there, he goes aa step further, daring to predict what various scenarios for our future sexual lives might look like...