Science Says: This Is Why You're Gay

A new study links sexuality with birth order.by Katie HerzogA new study suggests that a love of sailor caps and mesh thongs may be connected to a protein on the Y chromosome. Michele Tantussi/Getty Images
The idea that sexuality is tied to biology is nothing new: Scientists have been looking for the "gay gene" for decades, and more recent research has demonstrated that boys with older brothers are more likely to grow up to be gay. Now, we may know why.According to a new study published in the Pr