Does size matter? A new finding shows evidence of a link between the relative length of a man’s index and ring fingers and a way to predict the length of his penis. Asian scientists have found that the ratio between the second and fourth digits on a man’s right hand seemed to correlate to the length of his flaccid and stretched penis, with a lower index to ring finger length ratio indicating a longer penis.
Over the past decade, the correlation of digit ratio with sexual behavior and other aspects of reproductive biology have been well documented and there is a growing list of traits with links to digit ratio, although the associations are less well established.
The key to this relationship may lie in the womb. In Ho Choi of Gacheon University Gil Hospital in Incheon explains:
“During the fetal period, high concentrations of testosterone lead to high testicular activity, resulting in a lower digit ratio. In the present study, patients with a lower digit ratio tended to have a longer stretched penile length.”
Choi and colleagues compared the digit ratios of 144 Korean men aged 20 and older who were being treated for urological surgery. Researchers measured the index and ring fingers of each man’s right hand and compared the ratio to the length of each man’s fully stretched, flaccid penis (the latter data obtained under anesthesia).
In a journal commentary, Denise Brooks McQuade of Skidmore College, Saratoga Springs, N.Y., said the study results “provide convincing support for a relationship between digit ratio and penile length.” She added that the findings might have real value for research into clinical conditions linked to developmental issues in men.