I don't know if the "walking in fron" thing isn't just a "japanese thing", because my sister in law is japanese and when she first came to Germany it always seemed as if she'd be hurrying off somewhere and at first we (my family) tought of it as kind of weird (sometimes we even had to call her on her cell phone 'cause we totally lost sight of her).
She doesn't do that a lot anymore but at first it really struck us as different. I just want to say that maybe it is a "culture thing" and not a "guy thing".
Sorry, if that was off topic >.<
and i don't even have to say anything about japanese guys -.-