Should you judge a man by his ratio?

Beyonce's advice to men, "if you liked it then you should have put a ring on it" could apply to women as well, and they should check out the length of the finger, if a McGill University study is to be believed.

If his index finger is shorter and his ring finger longer, he may make a better husband, according to the study.

"When with women, men with smaller ratios (between index and ring fingers) were more likely to listen attentively, smile and laugh, compromise or compliment the other person," Debbie Moskowitz, lead author and professor of psychology at McGill said in a press release.

Those men also tend to have more children than men with shorter ring fingers.

Certain hormones in the womb cause a baby boy to develop a longer ring finger and affect his behavior as an adult, researchers say.

Earlier studies indicated that the ratio between the length of a man's index finger and ring finger indicate the amount of testosterone and other male homes the fetus is exposed to in development.

A smaller ratio means more male hormones, which the McGill study implies that this has an impact on how men behave and interact with women as adults.

The 20-day study asked 155 participants to fill out forms, checking off a list of behaviors they engaged in for every social interaction lasting five minutes or more.

They classified certain behaviors as agreeable or quarrelsome. They found that men with small digit ratios reported about a third more agreeable behaviors and about a third fewer quarrelsome behaviors than men with large digit ratios.

We don't expect hand prints and tape measures to become part of standard dating equipment, and we hope no good relationships are broken because of unfortunate ratio results.

But the same sort of in-depth study of a potential mate's behavior and attitude is certainly a worthwhile investment.