The integration of psychological, social, and biological components of human sexuality in this text is facilitated by the authors' combined academic and professional backgrounds. Robert Crooks has a Ph.D. in psychology. His graduate training stressed clinical and physiological psychology, and he has considerable background in sociology. His involvement with teaching human sexuality classes at the university, college, and medical school levels spans over two decades. Bob and his wife, Sami Tucker, have been involved in the establishment and implementation of HIV/AIDS intervention programs in tw...