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David P. Barash, Ph.D., is a zoologist and is currently professor of psychology at the University of Washington in Seattle. He is the author of more than a dozen books, including Making Sense of Sex, co-authored by Judith Lipton. Judith Eve Lipton, M.D., a psychiatrist specializing in women's issues, is the recipient of many honors, including a fellowship in the American Psychiatric Association. Married since 1977, Barash and Lipton live in Redmond, Washington.