Digit Ratio (2D:4D), Transgendered Belief, and Transsexual Drug Therapy in the BBC Internet Study

Transgendered belief—the conviction that one is the opposite gender to one’s natal gender—may be influenced by prenatal sex steroids. We consider this possibility by examining the relationship between digit ratio (2D:4D—a suggested correlate of fetal testosterone and estrogen), natal gender, felt gender, and transsexual drug therapy in a large online survey (the BBC Internet Study). There were 209,317 participants who reported their gender,...