Harkness club

Similar to the mile high club, you are considered part of the "Harkness club" after having sex on a Harkness table, a large, wooden, oval table seating 12 students. Primarily found in American, New England, prep schools which use the Harkness system of learning such as: Exeter, Lawrenceville, Andover, etc.

"Dude, I totally banged that chick in Mem. Hall last night!"
"Woah, are you part of the Harkness club now?"
"Oh yeaahh!"

*High five*