For a while when the "Got Some!" thread started, we posted every time we had sex. It got to be so we raced afterward to see who would get to pose "DING! for the lurkbastids" first. After a while the novelty wore out, but not before we'd gotten a bit of a reputation
Other than that, I haven't kept any kind of log. I think it'd be kind of fun, though! Looking back in 30 years and seeing "Really good doggy style on the kitchen floor - came three times" would be a nice reminder of my youth