I recall the very first wallet I received, I was about thirteen. There was a card in it that you were supposed to fill out with your personal information. I laugh as I write this. When I came to the word sex, I just wrote no on the line next to it. After all, I was only thirteen and I wasn't having sex yet. I was very naive at that time, we're talking 40 something years ago when girls didn't grow up as fast as they do now.
Later I came to realize they really wanted to know what sex I was.