[RealJames]

On average shorter yes, both in height and in length.
Lots of guys here are taller than me, generally I'm taller though.

If you wanna take a shot in the dark you're aiming at odds.

In my experience, going the other way, Japanese women are generally significantly more petite down there than their wester counterparts, then again a few of the women I've been with here have been more spacey than the westerners I was with...