Roman baths originally separated men and women. During the Republic they were divided by a wall with the section for women being usually smaller than the one for men. During the Empire, it was common for bath houses to be mixed.
Were Roman baths unisex?
In the Roman bath houses, men and women did not bath together. It was considered to be in poor taste so, each had their own designated time at the bath house. For instance, woman may have been allowed in the bath houses in the morning while men came in in the afternoon.
Why did the Romans have baths together?
The main purpose of the baths was a way for the Romans to get clean. Most Romans living in the city tried to get to the baths every day to clean up. They would get clean by putting oil on their skin and then scraping it off with a metal scraper called a strigil. The baths were also a place for socializing.