Paris: Ever wondered why some men look so attractive. Well, the credit goes to their ring fingers!

A study has revealed that the longer a man's fourth or ring finger is compared to his index finger, the more likely he is to be judged attractive by women.

The results, published in the British Royal Society's journal Biological Sciences, unveil intricate links between foetal exposure of males to hormones, the development of certain physical traits, and what turns on the opposite sex.

It also adds to a growing body of research -- conducted under the banner of evolutionary psychology --suggesting that the drivers of human behaviour are found, more than previously suspected, in "nature" rather than "nurture."

Earlier studies had already shown that the size ratio between the fourth and second fingers, especially of the right hand, is a reliable indicator of the extent a man was exposed to testosterone while still in the womb.

The bigger the gap between a longer ring finger and a shorter index, the greater the likely impact of the hormone.

Agencies