I personally know a few couples where either the man or the woman is foreign and I noticed quite a lot of differences in the kind of relationship they have.
Please note that the following is based on my personal experience and that not everybody out there is like that.
For some reason (maybe through the consumption of too many Hollywood movies) Japanese women think that foreign men are like that!
They’re not afraid of showing their feelings in public or telling their girls flat out how they feel about them. The extreme version of this is known as “gaijin hunter” and some will do everything for the sake of having one of those adorable “half”-kids (half Western, half Japanese) just to toss their foreign guy later on.
Some of us will go through a hard time here in Japan.
At least getting one woman after another into your bed, is really easy, even if you’re quite ugly!