reveal said:He's circumcised.
I didn't get your joke because I was raised catholic and so I know that catholics are not required by their religion to be circumcised (although many Americans, catholic or not, are circumcised at the hospital shortly after birth). So I was looking for a scapular or rosary beads in the picture. Many Jews practice a ceremonial circumcision ("bris") but some have started to drop the practice.
I'd love to make fun of the Peter Pan fellow, but since I spend some of my free time pushing little figurines around on a table among a group of adults shouting things like "I fire my magic missile" and "I have boots of escape," well, I figure I better not throw any stones... I'd be too afraid of my wife telling me, "YOU'RE making fun of HIM? Pot calling the kettle black, mister!"