swing report 

n.: a private diary kept by a swinging couple. The diary maintains partner names, dates, and locations as well as brief descriptions of explicit sexual encounters with anonymous partners. The entries may also include "likes" and "dislikes" of certain prospective partners, in order to gain a competitive edge on the group at future swing parties.

"Melanie and I read one of our swing reports from the 2005 fiscal year...and you would not believe how much we spent on anal-related costs and mergers!"

swing report by Dr. Josephus February 28, 2009