Seclusion of girls at puberty
The seclusion of girls at puberty has been practised in societies around the world, especially prior to the early 20th century. In such cultures, girls' puberty held more significance than boys' due to menstruation, the girl's potential for giving birth, and widespread ideas of ritual purification related to the sacred power of blood.
Source: Wikipedia — Seclusion of girls at puberty (CC BY-SA 4.0)