Same if inbreeding is practiced. So, the claim that for example, mid-easterners with their penchant for marrying cousins, or the Swiss with their insular village communities ..
For example, I don't think that (on average) the locals where I live are particularly beautiful in comparison to other countries, but a lot of foreigners seem to disagree with me.
Source?
I'll look for better (primary) sources when I'm not on my phone if I remember. I vaguely remember seeing a bunch of stuff about how humans naturally gravitate towards genetic diversity, unless there's some roadblock preventing it. I don't have a source offhand though so until or unless I find one, remember to add your salt :)
I understand where that comes from: it's a stereotypical generalisation, but Russian middle-aged men drink themselves to death. Large areas of Russian countryside operate on granny energy only.
So, the "supply" of women exceeds "demand" in Russia.
What puzzles me more is how UAE, Qatar and Kuwait have such a high male-to-female ratios. Is it because of large populations of foreign workers that are predominantly male?