Finns divorce because they can. There are little economical, social or religious reasons to stick together when the 'love' has dies out. Women also have an incentive to divorce since they can rob 50 % of the belongings from the man and child support is guaranteed by the law. Foreigners are seen by some as 'exotic' and I would argue there are biological (dealing with genetics) to breed with someone coming from far away.
There are just my thoughts...