Teaching a 5 year old boy how to sing!

Tonight I was teaching a 5 year old boy how to sing. It was his second voice lesson. We were coloring the anatomy of the organs/body parts that aid in singing. I asked him to color the diaphragm. He responded, "OK. But first the body needs a penis!" I tried my best to keep him on task but before I could get control of the situation, the penis was drawn! I guess he wanted the skeleton to be a boy just like him! Oh the joys of teaching!!!