I know when I first did oral.. I was quite young... I have no idea how young..
really just experimentation..

But.. Then I went to boarding school.. (all boys).. and I virtually lived in the library.. and whats a horny bookworm guy to do?? But read like hell..

The librarians did their best to "weed out" the most lascivious books.... but not all of them

Jean Auel's books were quite a favourite..

I think I did pretty well, considering I had no one to practice on.