It's true what they say - hand size is a good indicator of what a man has going on below the belt.

A team of Korean researchers have discovered a way to determine penis size (without actually dropping any pants).

The lower the ratio of the length of the index finger to the ring finger, the longer a man's penis may be, according to the Asian Journal of Andrology.

Researchers at Korea's Gachon University studied the penis sizes of some 144 men, age 20 and older and undergoing urological surgery for conditions unrelated to penis length.

Other factors like the patients' height and weight were considered.

Apparently, hands are the best indicator.