Do your workplaces still have work socials or parties?
I recall my dad going to at least one work Christmas party (I sat outside), and I worked in one call centre for a short time that had monthly (non-obligatory) nights out, which I thought was cool. I've worked in public sector places that said they don't do Christmas parties any more.
My guess is when they do regularly happen, it's not only fun for some people, but increases the chance of colleagues becoming friends or partners (I definitely know a few people who made all their friends at their workplaces). Life connections are all about probabilities and more social opportunities means more probability of connections.