This is interesting.... Some researchers at Northwestern University (yay Illinois!) are soliciting DNA from 1000 pairs of brothers where one of the 2 is gay. They're looking for evidence of a genetic root for homosexuality.
The Chicago Sun-Times has the full article here: http://www.suntimes.com/lifestyles/health/72296,CST-NWS-gaygene26.article
What struck me the most was the supposition casually mentioned in the article that current thinking is that homosexuality is 40% genetic and 60% environmental. I've always wondered what the causes are (for obvious selfish reasons), but to be honest any answer is scary. Ultimately, if we can determine a cause... does that mean that we could determine a "cure"? And if there was a cure (setting aside the tangle of moral dilemmas entailed)... what would that mean for our society? At the least, the world would be a much less fabulous (and interesting) place. :(
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