EXAMPLE A: Hair Whorl (Men)
Gay men are more likely than straight men to have a counterclockwise whorl.
EXAMPLE B: Thumbprint Density (Male)
Gay men and straight women have an increased density of fingerprint ridges on the thumb and pinkie of the left hand.
EXAMPLE C: Digit Proportions (Female)
The index fingers of most straight men are shorter than their ring fingers, and for most women they are the same length or longer. Gay men and lesbians tend to have reversed ratios.
EXAMPLE D: Hand Dexterity (Male)
Gay men and lesbians have a 50 percent greater chance of being left-handed or ambidextrous than their straight counterparts.
The Science of Gaydar
If sexual orientation is biological, are the traits that make people seem gay innate, too? The new research on everything from voice pitch to hair whorl.
read more here