Students "hook up" at Centre College, as they do at most other colleges. The term is deliberately ambiguous, covering all sorts of ill-advised physical intimacy from kissing to intercourse, usually while drunk.
Not all students hook up, though. Recently one of those who does not was describing a conversation among a group of students, in which they started listing all the people each had hooked up with. It became a game to see if they were all linked indirectly in this way. All of them were – except my student (and bully for her, I say).
I passed this on to my brother-in-law. He says this issue arose one day in his Cornell University dormitory, Risley Hall, where they made a giant hook-up map which connected all of the dormitory's residents – save my brother-in-law and his roommate. And bully for them, too. He says this conversation led the Cornell students to create a special term to describe how two people who have hooked up with the same third party are related to one another. The word they came up with is "unkatunk," which, as far as he can recall, was just a nonsense sound that appealed to them. And sure enough, the word appears on UrbanDictionary.com, with this definition:
defines the relationship in which you and someone you know have slept with the same person. kind of a variant on the transitive property of sexual multiplication.
a < -- sex -- > b
b <-- sex -- > c
a < -- unkatunk --> c
orig. Risley Hall, Cornell University
My surveys at Centre revealed that hooking up does not go all the way to intercourse as often as other people think it does. I expect the same is true at Cornell. Nonetheless, if, say, Facebook were to connect all the various hook ups it notes, I would guess that three quarters of the entire national college-going class are within six degrees of unkatunk of one another.