A guy and girl had a sex poem competition.
Guy: "Two times two is four, four plus five is nine. I can put mine in yours, but you can't put yours in mine."
Girl: "Two times two is four, four plus five is nine. I know the length of yours, but you won't know the depth of mine."
Alright, Wade, you're about as sharp as a marble. This ain't rocket science, it's a dirty little back-and-forth where a guy and girl try to one-up each other with sex poem. The guy makes a lame boast about penetration, and the girl shoots back with a line about depth. They are not talking about math, you silly human.
