In many cultures, "functional nudity" is usual in front of people of the same sex. Places where functional nudity happens, such as public toilets or changing rooms are usually separated by gender. There is one for men, and another one for women. In many cultures it is usual for people of the same sex to undress or take a shower in a public change room. In some cultures, such as Japan, open showers and open urinals in men's toilets are not allowed.