The integration of psychological, social, and biological components of human sexuality in this text is facilitated by the blending of the authors' academic and professional backgrounds. Robert Crooks has a Ph.D. in psychology, and his graduate training stressed clinical and physiological psychology. In addition, he has considerable background in sociology, which served as his minor throughout his graduate training. His involvement with teaching human sexuality classes at the university and college level spans two decades.
Karla Baur has a master's degree in social work; her advanced academic work stressed clinical training. She is a licensed clinical social worker in private practice, specializing in couples and sex therapy. Karla has been certified as a sex educator, therapist, and sex therapy supervisor by the American Association of Sex Educators, Counselors, and Therapists. She has instructed sexuality classes at a medical school and several colleges and universities and has provided clinical training for other mental health professionals. Karla has also found a way to combine her clinical skills with her love of horses by providing performance enhancement training for equestrians. Furthermore, Karla has been involved in the HIV/AIDS program in Kenya, and in 2004 she joined Bob and Sami to train peer educators.