I've written before about the various ways of telling whether someone is gay by things like their finger length. Now it seems that there is a new way to tell if someone is gay. If you're a guy and you are looking at the top of another guys head who is currently performing oral sex on you - you can be 30% sure if he's gay or not according to this study.

Check out the abstract (I absolutely LOVE the introducing statement):

While most men prefer women as their sexual partners, some are bisexual and others are homosexuals. It has been debated for a long time whether a person's sexual preference is innate, learned, or due to a combination of both causes.
It was recently discovered that the human right-versus-left-hand use preference and the direction of scalp hair-whorl rotation develop from a common genetic mechanism. Such a mechanism controls functional specialization of brain hemispheres. Whether the same mechanism specifying mental makeup influences sexual preference was determined here by comparing hair-whorl rotation in groups enriched with homosexual men with that in males at large. Only a minority of 8.2% (n = 207) unselected 'control' group of males had counterclockwise rotation. In contrast, all three samples enriched with homosexual men exhibited highly significant (P < 0.0001), 3.6-fold excess (29.8%, n = 272) counterclockwise rotation. These results suggest that sexual preference may be influenced in a significant proportion of homosexual men by a biological/genetic factor that also controls direction of hair-whorl rotation.

Now what would this hair swirl exactly look like so you can be an informed citizen? Here's the culprit. Be on the look out for this person who may be homosexual (or more likely not homosexual).