A childhood belief about oral sex

When I was in elementary school, we'd been learning about oral history (passing stories down through generations), and been assigned oral reports in Speech class, so to me, the word "oral" meant speech, or speaking. (Well, either that, or a nasty, painful trip to the dentist.)
Some local sex scandal erupted when I was about 9... I forget what, exactly, but on the way home from school, my Mom and I were listening to the radio news, and I heard the phrase "oral sex" for the first time.
"Oh, I didn't know you could have oral sex!" I blurted out. "I thought that was a physical thing - you mean people do it over the phone, too?"