Why do people have sex? Is it solely for the purpose of passing on genetic information, or are there other reasons? A candid, no-punches-pulled interpreter of the core ideas of evolutionary biology (Science News), author Niles Eldredge unravels the origins of our coital instincts. Whereas other scientists dismiss human sexuality as a helpless response to the same deep-set biological imperatives that govern the behavior of lesser animals, Eldredge...