In the sauna it is a to wear clothing in the hot room, although it is acceptable to sit on a small towel or "pefletti", a disposable tissue designed to endure heat and humidity (it can be mandatory in a public sauna, such as at a public swimming pool). While cooling off it is common to wrap a towel around the body. Although mixed saunas are quite common, for a typical Finn the sauna is, with few exceptions, a strictly non-sexual place. In Finland a "sauna" means only a sauna, not a brothel, sex club, or such. In public saunas, swimsuits are banned from the hot room for health reasons: in many indoor swimming pools, chlorine is added to the water for hygiene reasons; if swimwear used in such water is brought to the hot room, the chlorine will vaporize and cause breathing problems for people with asthma or allergies.