I was recently issued a 3rd Class medical so I can get my private pilot, and I'm planning on just flying for fun. I needed to get a couple tests because of a single medication-induced loss of consciousness that happened more than 10 years ago. The tests showed that I am normal, and I have not been on any medications for at least 10 years and am generally in good health. So I was in the shower two weeks ago, squatting down in (ahem) a moment of passion, which was pretty intense. When it was over I stood up quickly, then felt very queasy, and a moment later I found myself on the floor, apparently having fainted. Surprised, I stood up quickly, and again found myself on the floor. I stood up, and a moment later I felt totally normal again. I looked at the clock and only a couple minutes had passed, and I had a couple minor bruises, presumably from the fall. I've gone about my life normally since then (including exercise) with no problems, and I've flown twice with my CFI with no issues. So apparently I fainted from standing up too fast after my, um, shower activities. I have not fainted at any other time in my life. I think the cause of this incident is pretty obvious and I doubt there is anything medically wrong with me. My question is, am I required to go confess this incident to my AME? And if I don't go confess it now, but I do report it on my medical form when I renew my medical in two years, is the FAA going to ask my why I continued to fly for almost two years after an incident of loss of consciousness, even if I have no other incidents? And would they require additional tests? It seems that reporting it might raise a flag for the FAA because of my one other episode of loss of consciousness, even though that episode was not related to this. Might it serve the greater good to just let this incident disappear down the memory hole as long as it doesn't happen again, and not report it?