There's a lot that I don't remember from high school. Algebra. Most of the Italian language. But something my high school health teacher said about premarital sex is still embedded in my mind 10 years on.
She said that on our wedding night, when we have sex with our (future) husband or wife, all the other people we've slept with would be sleeping alongside us. She meant it figuratively, of course -- she was trying to get us to think about promiscuity through the frame of premarital sex being a bad thing. How crowded, she seemed to be asking, did we want our marital bed mattress to be?