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It doesn't say anything about that," Savic said.

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They might be due to the organizing effects of sex hormones as fetuses grow in utero, for example--or they could be the result of environmental factors experienced since birth.

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Study: Sweat odor affects women, gay men alike

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The hypothalamus is a region of the brain lying just above the pituitary gland, which is the master control for hormones, the body's chemical messengers.

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Description: Animals, fish and insects give off and respond to pheromones, but their existence in humans remains debatable despite compelling evidence from McClintock and others, Savic said. The current climate of debate over whether homosexuality is a matter of choice or is inborn makes such research extremely controversial, noted team leader and neuroscientist Dr.

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