A guy and girl had sex poem competition.

 A guy and girl had 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."