There are different types of bathrooms around the world.
No matter, that I am in Europe, the primary type of bathroom here is the "Asian" type-completely tiled, drain on the floor. The "shower curtain" just separates the shower from the toilet. And curtains are not so common. At home, I don't have a curtain.
Even when there is a bathtub, there is a floor drain.
The other popular thing is the "shower cabin". Drains are again the same- central floor drain and additional-for the cabin.
Larger bathrooms can have more drains. If it's renovated in the past 4-5 years, the floor drain can be "hidden" type. They are expensive, but really good piece of new technology. They can be built in the floor or in the wall. The most luxury types are really hidden-almost unnoticeable.