No, really, the most important lesson I learned is not to abandon the secret of eternal youth when bathing. Also, I've noticed when reading about classical religion that several cultures included sex with priestesses as part of worship. If people really think our society is becoming too secularized, would that not be the perfect way to revive interest in religion?
On a related note (related to Gilgamesh, that is, not religious sex), when I was in fifth grade, our class had a project where we had to invent our own galaxies. Kind of an impossible assignment, really, and I know several of the kids only created a solar system. I did have different stars and planets in mine, but certainly nowhere near as many as an actual galaxy would have. But anyway, the reason this came to mind is that the leaders of the gods worshipped in my galaxy were Ningnoolda and Kinkoodoo. Am I just seeing connections where there are none, or do these names sound like they'd fit in with those in the Mesopotamian legends? I hadn't heard of Gilgamesh's best friend Enkidu at this point, but "Kinkoodoo" is pretty similar, is it not? I also remember someone pointing out how Kravoo, the mineral-rich planet the size of a galaxy, had a name similar to that of Naboo from Star Wars, but of course The Phantom Menace wouldn't come out for another twelve years or so when I came up with that name.
While I've been able to find a fair amount of stuff from when I was in second grade, the stuff from my later elementary school years, when my main passions were outer space and classical mythology, has apparently been lost. I do remember a fair amount of it, though. Ask me sometime about Froomosongs, or Tweeadadot, or Minnephraphtolopolar. Or don't, because I'm sure no one but me really cares.