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1.
A flow chart showing who has slept with who within a social group. It takes the form of a page of names with lines joining the names of people who have slept together.

More advanced charts will colour code the lines by type:
* One night stand
* Gay
* Relationship
* Orgy
Dude we got drunk last night and drew a shaganomicon, Dave is a total slut!
by Paul off the television January 19, 2011