Forget the length of his nose, his shoe size or other popular myths, it appears that the clue to the size of his manhood is in his hand.

Scientists claim that the length of a man’s penis may be related to the ratio between the second and fourth digits on his right hand.

“According to our data… the shorter index [second] finger than ring [fourth] finger you have, the longer stretched penile length you have,” wrote Tae Beom Kim of the urology department at Gachon University Gil Hospital in South Korea.

The researchers described the “digit ratio” as the length of the index finger divided by the length of the ring finger. The lower the number, the longer the penis is thought to be.

The findings, involving 144 men and published in the Asian Journal of Andrology, suggest that the effects of testosterone in the womb may influence the length of a man’s fingers and penile length.

The men’s penises were measured, and stretched, while they were under anaesthesia and then compared to the length of their fingers.

The study’s authors concluded that higher prenatal exposure to androgens, such as testosterone, is responsible for both the lower digit ratio and the longer penile length.

Digit ratio has been correlated with a number of aspects of reproductive biology and sexual behaviour over the past decade, including a link with the risk of developing prostate cancer.

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