> The curious question is, if the man isn’t doing what you’re supposed to be doing to find a partner, like mingling with more people, how did they end up with their current (and only) partner in the first place? They had to do at least some socializing to get a date.
The answer to the question is right there: in high school and college, you're effectively forced to socialize to at least some degree; you're a captive in the education system, and unless you suffer from tremendous anxiety or are wildly unpleasant to be around, you'll spend a large percentage of your time socializing with other people.
(There's also the other obvious answer: a lot of introverts socialize a lot online, and many of them meet their partners the same way. I'm sure at least some of you have been to a wedding where the married couple met over WoW.)