Heh! I can actually imagine that normal people are not aware of the meaning. I know I often come across RL people whom I would expect to be familiar with, ah, relevant terminology, but then it turns out I've got to explain the bloody obvious.

Some time ago, I had to explain what "butt plugs" are - to a woman in her 20s, who studies media and knows her way around the Internet. And has a sex life, presumably. I was quite shocked, I can tell you.