Hey ladies, new study finds size really DOES matter

Posted at 3:26 PM, Feb 19, 2015
and last updated 2015-02-19 18:41:30-05

MONTREAL -- Can you judge a man by the size of his fingers? A new study has found you can. Researchers at McGill University in Canada studied finger size ratios in men and suggested that the results had an impact on how men behave towards women. The study found men whose index finger was smaller than their ring finger were more likely to smile and laugh, compromise or compliment women. On the other side, men with larger index fingers exhibited a more contentious nature.

Maybe you should take a good look at your partner’s fingers before putting a ring on one. Men with short index fingers and long ring fingers are on average nicer towards women, and this unexpected phenomenon stems from the hormones these men have been exposed to in their mother’s womb, according to a new study by researchers at McGill University. The findings might help explain why these men tend to have more children.

"It is fascinating to see that moderate variations of hormones before birth can actually influence adult behaviour in a selective way," Simon Young, a McGill Emeritus Professor in Psychiatry and coauthor of the study, said.

Several studies have been conducted previously to try to assess the impact of digit ratio on adult behaviour. This one is the first to highlight how finger lengths affect behaviour differently depending on the sex of the person you are interacting with. “When with women, men with smaller ratios were more likely to listen attentively, smile and laugh, compromise or compliment the other person,” says Debbie Moskowitz, lead author and Professor of Psychology at McGill. They acted that way in sexual relationships, but also with female friends or colleagues. These men were also less quarrelsome with women than with men, whereas the men with larger ratios were equally quarrelsome with both. For women though, digit ratio variation did not seem to predict how they behaved, the researchers report.

A previous study had found that men with smaller digit ratios have more children. “Our research suggests they have more harmonious relationships with women; these behaviors support the formation and maintenance of relationships with women,” Moskowitz says. “This might explain why they have more children on average.”

The researchers were surprised to find no statistically relevant link between dominant behaviours and digit ratios. They suggest future research could study specific situations where male dominance varies – such as competitive situations with other men – to see whether a correlation can be established.