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Content: Evolutionary psychology is the approach of explaining human behavior based on 
  the combination of evolutionary biology, anthropology, cognitive science, and 
  the neurosciences. Evolutionary psychology is not a specific sub field of psychology, 
  such as the study of vision, reasoning, or social behavior. It is a way 
  of thinking about psychology that can be applied to any topic within it. " Evolutionary 
  Psychology and the Emotions," by Leda Cosmides & John Tooby, from the 
  new book, Handbook 
  of Emotions, 2nd Edition, M. Lewis, J.M. Haviland-Jones, Editors, NY, 
  Guilford, 2000. Another explanation: Evolutionary psychology is the science that seeks to explain through universal mechanisms
of behavior why humans act the way they do (See, Assumptions About EP to Help Guide
You). Evolutionary psychology seeks to reconstruct problems that our ancestors faced in their
primitive environments, and the problem-solving mechanisms they created to meet those
particular challenges. From these reconstructed problem-solving adaptations, the science
then attempts to establish the common roots of our ancestral behavior, and how those
common behavioral roots are manifested today in the widely scattered cultures of the
planet. The goal is to understand human behavior that is
universally aimed at the passing of one's genes
into the next generation. As defined by Tooby and Cosmides:"Evolutionary 
  psychology is simply psychology that is informed by the additional knowledge 
  that evolutionary biology has to offer, in the expectation that understanding 
  the process that designed the human mind will advance the discovery of its architecture." "(