J Adolescent Health Halpern-Felsher BL, Cornell JL, Kropp RY, Tschann JM. Adolescents and oral sex: Perceptions, attitudes, and behavior. J Adolescent Health. 2005; 36(2):109-110. 2005 http://profiles.ucsf.edu/profile/76845732 Halpern-Felsher BL, Cornell JL, Kropp RY, Tschann JM