If sexual orientation is biological, then are there other traits that correlate with gayness?
New York Magazine has an interesting article on the science of analyzing physical characteristics that society interprets as "gay-like." For example:
Statistically, for instance, gay men and lesbians have about a 50 percent greater chance of being left-handed or ambidextrous than straight men or women. The relative lengths of our fingers offer another hint: The index fingers of most straight men are shorter than their ring fingers, while for most women they are closer in length, or even reversed in ratio.
About 23 percent had counterclockwise hair whorls. In the general population, that figure is 8 percent.
... gay men, like straight women, have an increased density of fingerprint ridges on the thumb and the pinkie of the left hand; and overall their arms, legs, and hands are smaller relative to stature (among whites but not blacks)
Link - via electro^plankton
Or worse, like trying to sort people by race:
Blacks: big penis and hands/ small brain
Whites: Average penis and hands/ average brain
Asian: little penis and hands/ big brain