From a norwegians point of view;

I can definately relate to the fact that most of the women i've been with have kept quiet about my size until a little while into the relationship. The ones who were the most vocal at the first encounter were actually women who had allready been with quite a few guys. So maybe it has to do with point of reference, maybe shyness. I don't know.

I think that the size in scandinavia is pretty much the same as in the rest of the world. Almost all of the women i've been with said that I was the largest one they had encountered, and I'm not that big.

I also dated a danish girl, and she said the same thing, only she got it into her mind that Norwegian guys were bigger than Danish guys, and jokingly told all her friends about that.