No daytime doing it
Though you might like a little afternoon delight, one polyamorous group in South Africa believes that -- unlike drinking -- sex during the day is pretty much just a step above the behavior of dogs. That said, should you find yourself in a thunderstorm, at the mercy of a bad dream, or if your husband just returned from slaying the local python, crocodile, or hyena, sexy time is welcomed in spades.
Sex ed class? More like sex ed orgy.
Deer Horn Muria, India
This forest-dwelling tribe in India takes sex ed to a whole new level. During their ceremonial Ghotul ritual, teenage boys and girls are taught songs, folklore, tribal dance, and the ins and outs (ha!) of getting it on. Girls drink a natural liquor that acts as a “contraceptive” and then choose a different partner every night. (FYI ladies, booze doesn’t kill sperm and you can get pregnant if you’re on top, #truth.) Sidebar: should this “contraceptive” fail and the girl becomes pregnant, the entire village raises the child because no one knows who the father is. This entire situation sounds remarkably like one giant Jerry Springer episode.