Remember That Time

It was not until I was 17 years old and my father borrowed an X rated video (the internet hadn't been invented back then and X rated videos had just become available because of video recorders and the Australian government had not legislated against that form of pornography yet) and when my parents were asleep I crept upstairs and watched it (with no sound of course). This is how I learnt what oral sex actually entailed.

But before the days of the internet and hardcore pornography (I guess prior to mid 1980s in Australia) how did women know what it was. I'm really curious to know.

Did their boyfriend teach you. In which case how did he know.

Did you just work it out for yourself?