Despite our seemingly endless fascination with sex and parenting, the origins of our reproductive lives remain a mystery. Why are a quarter of a billion sperm cells needed to fertilize one egg? Are women really fertile for only a few days each month? How long should women breast-feed? In How We Do It, primatologist Robert Martin draws on forty years of research to locate the origins of everything from sex cells to baby care—and to reveal what's really “natural” when it comes to making and raising babies. He acknowledges that although it's not realistic to reproduce like our ancestors did, there are surprising consequences to behavior we take for granted, such as bottle feeding, cesarean sections, and in vitro fertilization. How We Do It shows that once we understand our evolutionary past, we can consider what worked, what didn't, and what it all means for the future of our species.
Martin, an anthropologist and curator at Chicago s Field Museum, covers every aspect of human reproduction from fertilization to infant care in this thoughtful, well-written book. He takes an evolutionary approach throughout, exploring similarities and differences between humans, our primate relatives, and mammals in general, in an attempt to understand the origins of many of our behaviors and physiological patterns, and how these have changed, and continue to change as time goes on. Martin discusses the production of gametes (sperm counts have experienced a significant and shocking decline over the past 50 years), the patterns and purpose of menstruation, the value and cost of breast-feeding, and various mechanisms of contraception, among other interesting topics. His comparative analysis and expertise permits him to draw compelling conclusions, as he does in his examination of the reproductive tracts of mammals: All evidence combined indicates that the reproductive systems of both men and women are adapted for a one-male mating context with little sperm competition. But he also raises thought-provoking questions, such as why so many sperm on the order of 250 billion are released when only one can inseminate the egg. The only disappointment is that, despite the book s subtitle, Martin spends less than a single page looking at the future of human reproduction. Glossary.