[NSFW] How do you keep the list?

You know the list—the one where you keep track of all your lovers? I know people who keep spreadsheets. I know people who write down annotated bibliographies lists. I even once met someone who actually put notches in his bedpost (weird).

Do you keep the list? If so, why? What kind of information to you note down? What format do you keep it in? If you feel inclined, add any other information about the list you feel comfortable adding up to and including publishing the list here (not that I expect anyone to do that, but you never know).