The farmhouse my grandmother grew up in was still in the family when I was a kid, and there was still an outhouse.
It was a very fancy outhouse–3-holer, with ventilation. And spiders. (Well, probably). They weren’t just holes, there were seats on them, with lids. There was a bucket of lime in the corner with a scoop, to pour in after you were done.
By the time I went there as a kid they had the “new” house up and the old homestead was just used for storage of antiques (as I thought of them–but, come to think of it, they were). And the “new” house–built in the 1950s–had plumbing, and 'lectricity and all. But only one bathroom.
It used to amaze me that my grandmother grew up there with her 10 siblings, in that one-room house. According to her, they split it up with room dividers, as needed. When I saw it, it was one big room, with a loft over about 1/3 of it.
There was actual toilet paper in the privy, though, in case anyone had an urgent need while someone was taking a long bath in the new house. My grandmother said newspapers were better than the Monkey Wards catalogue anyhow.
My cousins and I all dared each other to go in there, and I think we all did, approximately once apiece.
The other family farm, the one from my grandfather’s side, had a bathroom with sink and toilet. However, although they had a sink and tub and toilet, they didn’t have water to the place until 1957! They put the appliances in before realizing what it was going to take to reroute the well and add a pump that could handle it.
When I was in college, in the early '70s, I went home with a friend for the weekend. At her place there was a sink, but the water was not piped into the house. It came in through a hose (why they could do a hose and not pipe the kitchen sink, I do not know) and the sink water drained right outside the kitchen window. They didn’t have a proper bathroom, either.
I will say, when my grandmother and all my great-aunts grew up, and got married, and had their own places, one place they did not stint was on the bathroom. My grandmother had a palace of a bathroom as the main bathroom in the house I remember, where she lived until she died, and there were two other bathrooms as well. This bathroom had a separate room for the tub, and another separate room for the shower, and an entire wall of slots for reading material next to the toilet, which was enclosed in its own room, with a door. My great-aunts had similar indulgences, including a fireplace in the bathroom in one case. I think this was because of their early deprivation.