Behavior change among homosexual college students to decrease the risk for acquired immune deficiency syndrome: Jean L. Richardson, Dr.P.H.,∗ Jacqueline Schott, Ph.D.,† Kimberly A. McGuigan,∗ and Alexandra M. Levine, M.D.,† ∗Department of Preventive Medicine, University of Southern California, Los Angeles, California 90033, †604 S. Saltair Ave., Los Angeles, California 90049, and ‡Department of Medicine, University of Southern California, 1995 Zonal Ave., Ste. 500, Los Angeles, California 90033