Weird Toilet Customs, a table

Republicans and IBS and sometimes podcasts make me think about going to the bathroom more often than I'd like.
Where there is a communal toilet, there tend to be: shared immunities, ease digesting local cuisine, an increase in shared parasites (some of which get rid of allergies! It's a thing. There's a whole deal where severe allergy sufferers go to Africa and poop in communal tribal toilets for a week and yeah they're standing in stranger's shit while squat-pooping but then they can go back to their lives allergy-free thanks to intestinal parasites or something.) Stuff that comes from sharing gut bugs. Travelers, thus many PCs, wouldn't gain the benefits until an extended adjustment period.

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What Weird Toilet Rituals Does This Place Have?
1 to 3	Everyone must shit in the communal toilet area barefoot. Especially those with mild to medium illnesses. If you do not, it will be assumed you have some terrible, fatal disease.
4	Pissing must be especially concealed, and never referenced. Roll on chart again, that result applies to pooping.
5	Each family has a communal toilet only family members use. Travellers must relieve themselves outside the town until adopted by a family.
6	There is a communal toilet swamp/crevasse, and all the town's deceased are left there to rot as well.
7	Some magical bullshit and the locals don't need to excrete waste and will be highly offended / "scientifically" curious at those who do
8	Outhouse kinda structures are all over, and the waste feeds something(s). People disappear sometimes, but it's fine. Really.
9	They just do it anywhere like it's no big deal
10	There are separate restrooms for a huge number of socially distinct groups but where you're supposed to go is nearly impossible to figure out if you're not from here and many of the distinctions seem arbitrary. It's very dangerous to be caught going in the wrong place.
11 to 12	All waste is reused for fertilizer and it's a crime and sin if you fail to submit all waste to the proper authority
13-15	Roll D12 Twice, first roll is what the locals do but travellers must do second roll
16-17	Roll D12 result especially applies to travellers from other places
18-19	Roll Twice
20	Roll a D12 on this chart, Travellers must do this but are then ushered out of town