Absolutely true. Sometimes people have cooperative bathtubs for a small apartment complex. It is important to follow the custom of cleaning first, bath tub after. I was relegated to being the last person into the tub where I lived because “gaijin”. I didn’t care, because I knew the drill and I got to stay in the tub as long as I liked. It was one of the older style where the water is heated and circulated by convection continuously. I made the mistake, once and only once, of falling to sleep in the tub. I almost did not make it out of the tub. I was very well done.