It may seem something of a non sequitur to swerve from talking about friendship to public baths, especially when that latter topic has come up before. But
Year Four's essay focused on such baths as a place one goes to get clean, devoting only half a sentence to the notion that they might also be -- often were, and are -- a social nexus.
For this to make sense, you have to expand your mental image well past bathing as the modern goal-oriented shower at home (get in, get clean, get out), and think more in terms of a spa. Or the better comparison nowadays might be a beauty salon, the kind of place you go to get your hair cut, dyed, and/or styled, while somebody nearby is having their nails done. These tasks can take a while, and if your local salon has a clientele of regulars who know each other and the staff, of course people will fill the time with conversation. (Or we
did, before people had smartphones to stare at instead.)
Public baths
can be just a place to get clean, but that's rarely all they are. As a result, going to one is less likely to be an errand you check off in the middle of your busy day and more likely to be a good chunk of the day all on its own, as you attend to a variety of bodily needs -- at least if you're sufficiently wealthy that you can afford the add-on services, not just quick scrub.
Haircuts are a perennial need, of course, with frequency depending on style, and some kinds of hairdos (especially for women) that take enough time to set up that once done, you leave it in place for a week or more. Those with facial hair may need it trimmed or shaved off, whatever's the fashion; the same can be true of those who need a bald scalp for whatever reason, whether it's status, religion, clearing the way for a wig, or getting rid of lice. Nails also need care, and polish or dyes for those go back thousands of years. Massages are a natural accompaniment when the muscles have been relaxed by warm water -- and, yes, sometimes the "massages" are of the euphemistic kind; bathhouses are a notorious site of sexual activity, be that prostitution or unpaid hookups of an illicit (e.g. homosexual) type.
But massages in the therapeutic sense lead us toward more general medical services. And it turns out that the notion of going to a place of bathing for its "healing waters" is not be entirely bogus! Analysis of the waters in Bath, England -- famed as a healing center since pre-Roman times -- recently uncovered fifteen different species of beneficial bacteria that can help combat
E. coli,
Staphylococcus aureus, and other prime culprits for infection. Mind you, it's also possible for the waters of a communal bathing place to become a filthy breeding ground for bacteria that are much less friendly . . .
(I should note, by the way, that concerns over hygiene have also been used as cover for less admirable impulses. Where bathing is communal, you have the question of who's allowed in: not just gender segregation, but also class and racial. Just a bit to the north of me are the remains of the Sutro Baths, an indoor public swimming pool in San Francisco that in 1897 lost a legal battle over prohibiting a Black man from using their facilities. Racists absolutely couched their efforts at discrimination in health terms, casting minorities as inherently "dirty" spreaders of disease.)
The use of public baths for broader medical purposes means that going to such a place could be anything from a quick dip, to your entire afternoon, to several weeks of leisure while you "take the waters" in a suitably tony establishment. So let's look at what kinds of social opportunity that affords!
If it's a regular item on your schedule, odds are fairly good that you can expect to see certain friends (or people you emphatically do
not consider friends) every time you visit. That gives you a chance to at least exchange greetings and maybe some quick news about what's going on in your lives: not an in-depth conversation, but that isn't needed when you see each other every week.
Should you be spending more time there, however, more possibilities open up. Steam baths, saunas, and soaking pools give you a reason to lounge around for a while, perhaps enjoying a snack or a drink, or reading a newspaper if your society has those. Now the bath is a place you might go specifically
for the purpose of catching up on news and gossip -- useful if a character is trying to investigate something! It can also be an unparalleled opportunity to schmooze, with a socially adept character inserting themself into a nearby conversation with an interesting tidbit or a clever bon mot. The more exclusive the establishment, the more likely it is that this is one of the places the old boys' network (of whatever gender) operates, and gaining access is a great way to get a leg up.
And when it's not just the local bath but a whole town like Bath, now you're looking at sociability on the scale of tourism or a vacation. Whole families or groups of friends go there together, and being invited to join such an excursion signals a particular level of belonging. These trips might be seasonal -- especially if the site is known for its mild climate -- or maybe everybody with the money and freedom to do so decamps there in times of pestilence, hoping the healing waters may protect them. If enough people have gone at once, then this becomes the scenario you've seen in Regency romances: lots of maneuvering around courtship and marriage, with or without a side order of political intrigue.
I have to admit, though, that the core element here always feels a little odd to me. I grew up in a culture that's fine with swimming pools but emphatically does
not expect people to get naked around each other -- which is kind of necessary if you're trying to get clean! When I've been at an athletic club with a steam room or sauna, clients are expected to wear towels over key areas. So the notion of some key stages for socialization being clothing-optional is just
weird.
But weird is fine. Weird is an opportunity for worldbuilding!

(originally posted at Swan Tower:
https://is.gd/KL0Twg)