I forget the journal it's published in but there is research showing that height and penis size are indeed positively correlated, just as height and weight are.
That being said, the correlation was not very strong which means that a lot of men do not follow that general rule.
There's also a positive correlation between ice-cream sales and instances of shark attacks.
Positive correlation means nothing without control, and in this instance, I'd say there's certainly none of that
I'm 6'1, 3.5 inches long soft (i've never gotten a good soft girth measurement), 6 inches hard; about 5 inches around when hard.
It's not small, but it's not as big as people
expect someone of my height to have, which has caused me some problems here and there (ie-it looks small comparatively).
My boyfriend is 5'8; about 5.5 inches long soft, 8 inches long hard; about 4 around soft and 6.25 around hard (and yes, I measured those myself using actual, replicable, accurate methods).