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What causes a child to grow up gay or straight? Neuroscientist Simon LeVay summarizes a wealth of scientific evidence that points to one inescapable conclusion: Sexual orientation results primarily from an interaction between genes, sex hormones, and the cells of the developing body and brain. LeVay takes the reader on a whirlwind tour of laboratories that specialize in genetics, endocrinology, neuroscience, cognitive psychology, evolutionary psychology, and family demographics. He describes, for instance, how researchers have manipulated the sex hormone levels of animals during development, causing them to mate preferentially with animals of their own gender. In this second edition, LeVay adds a chapter on bisexuality, reviews some uncommon forms of sexuality, and considers whether there could be a biological basis for subtypes of gay people such as "butch" and "femme" lesbians.



About the Author

Simon LeVay

Simon LeVay is a British-born neuroscientist turned writer. He is best known for a 1991 study, published in Science, which reported on a difference in brain structure between gay and straight men. He has served on the faculties of Harvard Medical School and the Salk Institute in San Diego, but he now lives in Los Angeles. Among his 12 published books are several on sex, including a college textbook titled Human Sexuality (now in its fourth edition) , and Gay, Straight, and the Reason Why: The Science of Sexual Orientation. His most recent book is a historical novel, The Donation of Constantine. Once a fanatical bicycle racer, LeVay continues to ride his bicycle, though at a more sober pace. He is intolerant of creationists, lactose, and staying indoors.

LeVay writes: "In the early 1960s, as a teenager, I was arrested and jailed briefly, along with the renowned 90-year-old philosopher and mathematician Bertrand Russell. (The occasion was an anti-war demonstration.) This lead to my reading Russell's History of Western Philosophy. Only one paragraph in that long book stuck in my memory: it dealt with the mysterious 8th-century forgery known as the Donation of Constantine. Intrigue, papal politics, winter journeys, bloody battles -- maybe even a hint of bodice-ripping! What a great topic for a novel, I thought. Fifty years later, I wrote it."



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