Sex segregation in Saudi Arabia
Sexual segregation in Saudi Arabia is a cultural practice and government policy which keeps Saudi wives, sisters and daughters away from contact with male strangers (non-mahram) and vice versa. However, since Mohammed bin Salman was appointed Crown Prince in 2017, a series of social reforms have been witnessed that created cultural changes, which included putting an end to the sex (gender) segregation enforcement.
Source: Wikipedia — Sex segregation in Saudi Arabia (CC BY-SA 4.0)