Two people who are not friends don't really do the going for coffee thing either. We spend time with people we know and they might know someone who knows someone.

Before going out to the town we spend time at a friends flat/house and random people you might not know are invited there so mix alcohol and you get to know a new person, or so quite often you might have had sex with someone without knowing much about them then getting to know them better afterwards.

So we get to know each other with alcohol or just soberly at school/work.

the link is a lot better at explaining this part than I am tbh