It's a controversial idea, and they have not made public the details of what they did. But the research, being presented at a meeting of genetics experts, suggests a variety of factors come together to help determine whether someone is gay or straight.
"To our knowledge, this is the first example of a predictive model for sexual orientation based on molecular markers," said Tuck Ngun, a researcher at the David Geffen School of Medicine of the University of California, Los Angeles, who led the study.
Other experts said Ngun may be going too far in saying he can predict someone's sexual orientation by looking at his or her genes. His study group was very small. Read more here.
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