More than 1,000 health care professionals, educators, clergy, community service workers, patients and their family members are expected to attend the conference in the Buffalo Convention Center.

Major sponsors of the conference are the UB School of Medicine and Biomedical Sciences and the Erie County Medical Center Immunodeficiency Services.

The program will begin at 8:30 a.m. with a presentation on "Development of Human Sexual Orientation" by Simon LeVay, a neurobiologist formerly with the Salk Institute, LaJolla, Calif. Author of "The Sexual Brain," LeVay will review results of his landmark study that suggests there are differences between certain brain cells in homosexuals and heterosexuals. LeVay is co-founder of the Institute of Gay and Lesbian Education, West Hollywood, Calif.

"Sex in America: What Do We Really Do?" will be the topic of the second speaker in the plenary session, John H. Gagnon, professor of psychology at the State University of New York at Stony Brook. He will discuss major findings on adult sexual behavior in the U.S. based on data collected at the University of Chicago. Findings of the study, on which Gagnon was a co-investigator, challenged prevailing myths that previously shaped popular images of sexual conduct.

"The Healing Power of Humor" will be discussed at a noon luncheon by Leslie Gibson, health and humor consultant and director of Pegasus Expressions.

There will be workshops from 10-11:15 a.m.; 1:15-2:30 p.m. and from 2:45-4 p.m. on topics including "Drugs, Sex and HIV," "Cultural Differences in Sexual Expressions" and "Dimensions of Human Sexuality."

Co-sponsors of the conference are the AIDS Alliance; AIDS Community Services; Buffalo Chapter, American Red Cross; Deaconess Family Planning; Geneva B. Scruggs Community Health Care Center; AIDS Institute, New York State Department of Health; New York/Virgin Islands AIDS Education and Training Center; Sexuality Center and Weigel Health Center, Buffalo State College, and Western New York Regional HIV/AIDS Training Center, Erie I BOCES.

For Information on registration, call 645-2018.