What did you think sex was when you were a kid?

When I was like 8, I found out that sex was when "a guy and a girl touch their privates together." I remember picturing just literally a penis vaguely touching a vulva, like while the people were standing upright facing each other lol. No movement at all either, just 😐 welp here we are. Hahaha. 
Any funny stories about what you used to think sex was like?