Placing men and women bathroom signs is totally important if you try to design a building in which there will be a lot of people in it. Take the example of how you are trying to design an office. By considering that there are so many people who work in the office and those people will need bathrooms during their working time, you need to separate the bathrooms. Without the signs, the people will be confused about which bathroom they n eed to use. It is impossible for them to use the same bathroom because it will make them feel uneasy. And for the signs, make sure they are easy to see. The people should find it easier to determine which bathroom is for the men and which bathroom is for the women.