I know more about middle eastern culture than many of my friends. When an arab man invites you into his home at the door. You don't question, you say thank you and go right on in at the same time. I know lot of polite and impolite things to do there at the same time, I know lots of the culture first hand from a friend who is from there. We smoke hookah together he got me one from egypt on one of his trips home in jeddah.