Restaurants in Saudi Arabia generally have an entrance and eating section for families and another separate entrance and eating area for single men. Strict gender segregation is part of the culture here, and it is one of the things that bothers me most about life here. It is unnatural, and after 8 years here, I still haven't gotten used to it or grown to like it at all.
I personally happen to feel that the severe gender segregation in Saudi Arabia causes more problems than it is trying to prevent - as a result, many men have no idea how to behave themselves around women, harassing them, calling them nasty names, and saying inappropriate things. There is also a very high divorce rate here - many young men and women have an unrealistic idea of relationships and marriage and many couples do not really know one another very well when they marry. The gender segregation also seems to promote homosexuality, a reality which Saudi Arabia prefers to deny the existence of.