Most attempts to correlate penis size with other measurements fail because the sample sizes were too small to yield results that meet the generally accepted level of statistical significance (usually p<.05). One also failed because of confusion between European and American shoe sizes. Also, beware of any studies that rely on stretched length as a proxy for erect length because those are only weakly correlated. Two surveys reported in jackinworld.com, with large sample sizes, do show a correlation with both shoe size and height. Now before somebody comes up with "but I'm xxx tall and have a yyy cock," these are AVERAGES. It doesn't mean that EVERY guy who is 6'6" is bigger than EVERY guy who is 5'5". Nonetheless, they are correlated, and because hand size and foot size are also related, the length of the hand should also be correlated with penis length. For what it's worth, I'll throw in another bit of trivia: Somebody looked at the old Kinsey data and found that gays have willies that are significantly bigger than those of straight guys.