snotbuster, you have it exactly right! The idea of anyone having a whole bathful of water to themselves would have been met with incredulity!
We have always shared baths. Growing up I had wondered if only we did it, it's not the sort of thing you ask your friends is it? So I was relieved to find my husband seemed to think it fine and normal!
We shower 6 days a week and have a bath once a week. Generally the 3 children share a bath, i.e. one after another not at the same time, they're a bit old for that! They take it in turns as to who goes first, although strangely one child seems to prefer going last, I think it's because they get to soak longest.
Then we make sure the water is heated a bit more and my husband and I will have a bath a bit later. So really that's 2 baths between 5 of us I suppose. We did used to all jump in one after the other, but found those going towards the end weren't getting as much hot water - it was alright when the children were young but now they all like deeper, hotter baths.
We each have our own bath towel though.