>>10806382I did a post doc in Japan, about a third, perhaps half of my unmarried colleagues got married there. As for IQ I guess you need enough to do a PhD, get a post doc and learn some Japanese and have enough social skills to be accepted by her family.
Note these girls were from a rather small segment of Japanese girls, typically older than 25, educated, and planning to have a career in addition to a husband. And they seemed really determined. Back then in Tsukuba, Red River on Fridays was the meeting place and time for foreigners and Japanese girls scouting out the guys.
