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Simon LeVay that a small region of the hypothalamus is twice as large in straight men as in women or gay men. The finding is similar to a report in 1991 by Dr. Savic reports, as if the hypothalamus's response is determined not by biological sex but by the owner's sexual orientation. The gay men responded to the two chemicals in the same way as did women, Dr. The Swedish researchers have now repeated the experiment but with the addition of gay men as a third group.
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The two chemicals seemed to be leading a double life, playing the role of odor with one sex and of pheromone with another. The male sweat chemical, on the other hand, did just the opposite it activated mostly the hypothalamus in women and the smell-related regions in men. This is a region in the central base of the brain that governs sexual behavior and, through its control of the pituitary gland lying just beneath it, the hormonal state of the body. The estrogen-like compound, though it activated the usual smell-related regions in women, lighted up the hypothalamus in men. Savic and colleagues showed that the two chemicals activated the brain in a quite different way from ordinary scents. Most odors cause specific smell-related regions of the human brain to light up when visualized by a form of brain imaging that tracks blood flow in the brain and therefore, by inference, sites where neurons are active.