'Dr. Sex'

A human-sexuality expert creates controversy with a new book on gay men and transsexuals

J. Michael Bailey clicks on an audio recording of four men: Two are gay and two are straight. Can the audience guess which ones are gay just by listening to their voices? asks Mr. Bailey, a professor of psychology at Northwestern University.

When the majority of those in the Stanford University lecture hall decide that a man with hissy s's and precise articulation is gay, the professor