Oh, oh...now you did it! I'm over fifty and you forget that we're part of the Summer of Love/Woodstock generation. We were reading the KamaSutra before you were born. LOL! Trust me, that's probably just something your parents keep to themselves. And that goes to the whole point of this thread. There are some things that adults do that they don't have to tell their children. It doesn't make it wrong. And would you really want to know?
You forgot "The Joy of Sex"........which lived in the dark recesses of our basement for years until my adolescent son hit pay-dirt!
You're forgetting a great portion of that population was not part of "your flower generation" and were actually 'conservative' during your younger years.
You sound like you're a liberal turned conservative btw. Much like my mother who was a total hippy during those days. Father was a conservative drill instructor during "nam"...