05-15-2005, 12:12 AM
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#1 (permalink)
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32 flavors and then some
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More evidence of a biological basis for homosexuality . . .
At least in gay males.
http://www.msnbc.msn.com/id/7791888
Essentially, when straight men, straight women, and gay men were exposed to male pheremones, the sexual area of the brains of gay men responded like those of straight women, but straight men were unaffected. It seems the basis of gay men being attracted to other men is in the brain.
Quote:
Study: Homosexuals react to male sex hormones like women
The Associated Press
Updated: 5:19 p.m. ET May 9, 2005
WASHINGTON - The brains of homosexual men respond more like those of women when reacting to a chemical derived from the male sex hormone, new evidence of physical differences related to sexual orientation.
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The finding, published in Tuesday’s issue of Proceedings of the National Academy of Sciences, shows differences in physiological reaction to sex hormones.
Researchers led by Ivanka Savic at the Karolinska Institute in Stockholm, Sweden, exposed heterosexual men and women and homosexual men to chemicals derived from male and female sex hormones. These chemicals are thought to be pheromones, molecules known to trigger responses such as defense and sex in many animals.
Whether humans respond to pheromones has been the subject of debate, although in 2000 American researchers reported finding a gene that they believe directs the human pheromone receptor in the nose.
Biological basis to sexual orientation?
In the Swedish study, when sniffing a chemical from testosterone, the male hormone, portions of the brains involved in sexual activity were activated in gay men and straight women, but not in straight men, the researchers found.
When they sniffed smells like cedar or lavender, all of the subjects brains reacted only in the olfactory regions that handles smells.
The result clearly shows a biological involvement in sexual orientation, said Sandra Witelson, an expert on brain anatomy and sexual orientation at the Michael G. DeGroote School of Medicine at McMaster University in Ontario, Canada.
The research was funded by the Swedish Medical Research Council, the Karolinska Institute and the Megnus Bergvall Foundation.
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__________________
I'm against ending blackness. I believe that everyone has a right to be black, it's a choice, and I support that.
~Steven Colbert
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