[Nyororin]

I think that there is a level of self control involved in a casual relationship with a foreigner, more so than in a normal relationship, simply because in most cases marriage isn`t an option.
Even in a casual relationship between Japanese, if all else fails marriage is something to fall back on... And there are plenty of "baby = wedding" marriages out there. But this isn`t necessarily possible with a mixed race relationship, and even if it is considered a possibility by those involved - it may not be by the family of the girl. Getting pregnant is one thing and has enough stigma on it`s own... But getting pregnant by a foreigner, particularly military who have the (often deserved) reputation of just playing around and heading off? That`s an entirely different level.

In most cases, I would guess they avoid pregnancy, and if it happens - as Columbine said - there is little stigma attached to abortion.

Changing the subject a bit - I know that during the occupation there were countless relationships, very often with promises to send over for the Japanese girlfriend after returning to the US, that ended with a woman left alone with a baby... And no contact ever again. There was even a famous orphanage dedicated just to the children of these relationships that had tons of children - and they were just those whose mothers either died or were so destitute that they could not even feed themselves. There were countless more I am sure that were not given up to the orphanages.