The names, of everyone you have been sexually active with from Swingular since you joined?
Carve their initials instead of notches on your bed post and it's easier to remember......That's supposed to be humor.
We keep a database. Just added another Terabyte. 
We keep a data base as well :
ADOC4U Single Male (Burley, ID) 2 times
ITSPOINTINGNORTH Single Male (Midvale, UT) 5 years worth
WAREWOLF Lehi, UT (US) 2 times
FITNERD Bangkok Metropolis, (th) 1 time
ADOC4U Single Male (Burley, ID) 2 times
ITSPOINTINGNORTH Single Male (Midvale, UT) 5 years worth
WAREWOLF Lehi, UT (US) 2 times
FITNERD Bangkok Metropolis, (th) 1 time