ManY social scientists reject evolutionary views of human behavior because of their supposed genetic determinism. To establish that not all evolutionary models are inherently deterministic, I first review the perennial adaptationist-mechanist controversy in evolutionary biology. I then outline life-history theory, a burgeoning field of biology devoted to the study of reproduction, growth and development, and ecology in an evolutionary context. I undertake next to show how life-history theory can provide a satisfactory resolution to the adaptationist-mechanist debate. Combining Promislow and Harvey's arguments about the role of mortality rates in the evolution of life-history traits with Belsky, Steinberg, and Draper's attachment-theory model of the development of alternative reproductive strategies in humans, I propose that the allocation of reproductive (''mating'' and ''parenting'') effort in adults may be partially contingent on their early experience with the causes and correlates of local high death rates. I conclude with a discussion of some implications of this proposal for the emerging field of evolutionary psychology.