They Need A Course Correction

(My little sister is just about at that age where she is learning about sex and starting to ask questions about it. One day my dad and I are watching a show with her when, out of the blue, this happens.)

Sister: “[My Name], what do they call it when a boy puts his thingy inside the girl’s thingy?”

Me: *sputters, looking for an answer*

Dad: “Intercourse!”

Sister: “Oh, I get it! Because it goes in, of course!”