se o\rf lower ranks rather than the other way around, but lines are not closely drawn. E.\rxcept for special occasions, everyone pays for himself or herself regardless of wheth\rer or not an invitation is offered. It is quite acceptable for men and women collea\rgues, single or married, to go out together for lunch. This may be the extent to\rwhich your office friends will invite you. Although in general Americans readily take\rpeople home with them, they often do not want to mix business and social life. I\rf this is the case in your place of work, you will have to seek your friendships thro\rugh other channels.