because racism has a negative social value. this forces the racist to look for lower quality women. further, if they have a foreign partner the difference competency also gives the racist more power over his partner.  there is also the taboo theory of sexuality to consider, for the right it's often raceplay. you can also see this in the sissyfication process, where the racist embraces the taboo of unleashed female sexuality and race at the same time.
Norway