NEW: The largest study of its kind has found new evidence that genes contribute to same-sex sexual behavior, but it echoes research that says there are no specific genes that make people gay.
The study of nearly half a million people "provides the clearest glimpse yet into the genetic underpinnings of same-sex sexual behavior," said co-author Benjamin Neale.CHICAGO — The largest study of its kind found new evidence that genes contribute to same-sex sexual behavior, but it echoes research that says there are no specific genes that make people gay.
The research"provides the clearest glimpse yet into the genetic underpinnings of same-sex sexual behavior," said co-author Benjamin Neale, a psychiatric geneticist at the Broad Institute in Cambridge, Massachusetts. Some of the genetic variants found were present in both men and women. Two in men were located near genes involved in male-pattern baldness and sense of smell, raising intriguing questions about how regulation of sex hormones and smell may influence same-sex behavior.
Origins of same-sex behavior are uncertain. Some of the strongest evidence of a genetic link comes from studies in identical twins. Many scientists believe that social, cultural, family and other biological factors are also involved, while some religious groups and skeptics consider it a choice or behavior that can be changed.
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