At the Stabian Baths (Thermae Stabianae), Pompeii's largest, you can see the separate men's and women's facilities, changing rooms, with clothes-locker niches, and three cold, lukewarm, and hot (frigidarium, tepidarium, and calidarium).
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There are gender specific facilities at the Stabian Baths.
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There is no gender segregation at the Stabian Baths in Pompeii.