The Continuing Search for a Biological Basis of Gayness – By Brandon Keim

The search for a biological basis of homosexuality has come a long way from the “gay gene” searches of the early 1990’s. And though research hasn’t found simple causes, it has found enough physiological correlations — hair whorls, finger lengths — to suggest that gayness is fundamentally innate, though not so simple as to be produced by a mutation or three.

Because many of these newly identified ?gay? traits and characteristics are known to be influenced in utero, researchers think they may be narrowing in on when gayness is set?and identifying its possible triggers. They believe that homosexuality may be the result of some interaction between a pregnant mother and her fetus. Several hypothetical mechanisms have been identified, most pointing to an alteration in the flow of male hormones in the formation of boys and female hormones in the gestation of girls.