Danish journalist claimed that people peed their pants in public when she visited Japan?

I posted this on /JapanLife and someone there suggested I might take it here, and maybe get more serious answers.

Original post:

So, I've been reading a book from one of Denmarks pioneer female journalists, for the second time. I wondered about this the first time I read it, about twenty years ago, but couldn't find any mentions of it. I tried again today, and still nothing.

She went to cover the Olympic Games in Tokyo in 1964, and writes rather extensively on the peculiar customs and quirks she met with, and she did write a rather long paragraph about men peeing their pants in public. Either because they're trying to convey respect or excitement, or simply because they're not near a bathroom.

Since I haven't been able to find anything on the subject, I wondered, was this actually a culturally accepted practice? It seems odd that I can't find any sources on the subject, but I can't understand why on Earth she would make it up, either.. Just something that's been tickeling my brain for a bit!