YOUR early life as a fetus may have influenced your sexuality as an
adult—and your fingers tell part of the story. Researchers in California
have used relative finger lengths to show that sexual orientation is partly
determined by events in the womb.
In animals, prenatal exposure to the male sex hormone testosterone seems to
influence sexual orientation. But it is not easy to measure fetal hormone levels
in humans. One indirect way is to look at the size of a person’s fingers. In
women, the index finger, called the second digit or 2D, is about the same length
as…
